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Finding the Fourth Proportional to 18,721,854.10, 28,082,781.15 and 10,659,697.30

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Solution

The fourth proportional to 18,721,854.10, 28,082,781.15 and 10,659,697.30 is: 15,989,545.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,721,854.10 : 28,082,781.15 = 10,659,697.30 : x
  2. Step 2: Convert to fraction form
    18,721,854.10/28,082,781.15 = 10,659,697.30/x
  3. Step 3: Cross multiply
    18,721,854.10x = 28,082,781.15 × 10,659,697.30
  4. Step 4: Simplify right side
    18,721,854.10x = 299,353,946,401,145.88
  5. Step 5: Solve for x
    x = 299,353,946,401,145.88/18,721,854.10
  6. Step 6: Final answer
    x = 15,989,545.95

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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.