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Finding the Fourth Proportional to 10,402.80, 15,545.40 and 7,486.80

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Solution

The fourth proportional to 10,402.80, 15,545.40 and 7,486.80 is: 11,187.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,402.80 : 15,545.40 = 7,486.80 : x
  2. Step 2: Convert to fraction form
    10,402.80/15,545.40 = 7,486.80/x
  3. Step 3: Cross multiply
    10,402.80x = 15,545.40 × 7,486.80
  4. Step 4: Simplify right side
    10,402.80x = 116,385,300.72
  5. Step 5: Solve for x
    x = 116,385,300.72/10,402.80
  6. Step 6: Final answer
    x = 11,187.88

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.