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Finding the Fourth Proportional to 10,641,985.60, 15,962,978.40 and 7,240,763.20

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Solution

The fourth proportional to 10,641,985.60, 15,962,978.40 and 7,240,763.20 is: 10,861,144.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,641,985.60 : 15,962,978.40 = 7,240,763.20 : x
  2. Step 2: Convert to fraction form
    10,641,985.60/15,962,978.40 = 7,240,763.20/x
  3. Step 3: Cross multiply
    10,641,985.60x = 15,962,978.40 × 7,240,763.20
  4. Step 4: Simplify right side
    10,641,985.60x = 115,584,146,561,114.89
  5. Step 5: Solve for x
    x = 115,584,146,561,114.89/10,641,985.60
  6. Step 6: Final answer
    x = 10,861,144.80

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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.