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Finding the Fourth Proportional to 12,455.90, 17,179.42 and 7,980.07

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Solution

The fourth proportional to 12,455.90, 17,179.42 and 7,980.07 is: 11,006.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,455.90 : 17,179.42 = 7,980.07 : x
  2. Step 2: Convert to fraction form
    12,455.90/17,179.42 = 7,980.07/x
  3. Step 3: Cross multiply
    12,455.90x = 17,179.42 × 7,980.07
  4. Step 4: Simplify right side
    12,455.90x = 137,092,931.21
  5. Step 5: Solve for x
    x = 137,092,931.21/12,455.90
  6. Step 6: Final answer
    x = 11,006.26

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Half scale
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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.