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Finding the Fourth Proportional to 12,478.73, 17,220.51 and 6,813.46

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Solution

The fourth proportional to 12,478.73, 17,220.51 and 6,813.46 is: 9,402.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,478.73 : 17,220.51 = 6,813.46 : x
  2. Step 2: Convert to fraction form
    12,478.73/17,220.51 = 6,813.46/x
  3. Step 3: Cross multiply
    12,478.73x = 17,220.51 × 6,813.46
  4. Step 4: Simplify right side
    12,478.73x = 117,331,232.18
  5. Step 5: Solve for x
    x = 117,331,232.18/12,478.73
  6. Step 6: Final answer
    x = 9,402.50

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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.