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Finding the Fourth Proportional to 25,800,938.40, 38,715,404.40 and 10,656,400.80

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Solution

The fourth proportional to 25,800,938.40, 38,715,404.40 and 10,656,400.80 is: 15,990,382.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    25,800,938.40 : 38,715,404.40 = 10,656,400.80 : x
  2. Step 2: Convert to fraction form
    25,800,938.40/38,715,404.40 = 10,656,400.80/x
  3. Step 3: Cross multiply
    25,800,938.40x = 38,715,404.40 × 10,656,400.80
  4. Step 4: Simplify right side
    25,800,938.40x = 412,566,866,420,483.56
  5. Step 5: Solve for x
    x = 412,566,866,420,483.56/25,800,938.40
  6. Step 6: Final answer
    x = 15,990,382.21

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.