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Finding the Fourth Proportional to 12,478.30, 17,220.16 and 6,813.16

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Solution

The fourth proportional to 12,478.30, 17,220.16 and 6,813.16 is: 9,402.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,478.30 : 17,220.16 = 6,813.16 : x
  2. Step 2: Convert to fraction form
    12,478.30/17,220.16 = 6,813.16/x
  3. Step 3: Cross multiply
    12,478.30x = 17,220.16 × 6,813.16
  4. Step 4: Simplify right side
    12,478.30x = 117,323,705.31
  5. Step 5: Solve for x
    x = 117,323,705.31/12,478.30
  6. Step 6: Final answer
    x = 9,402.22

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Half 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.