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Finding the Fourth Proportional to 72,689,812.80, 109,034,719.20 and 52,282,478.40

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Solution

The fourth proportional to 72,689,812.80, 109,034,719.20 and 52,282,478.40 is: 78,423,717.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,689,812.80 : 109,034,719.20 = 52,282,478.40 : x
  2. Step 2: Convert to fraction form
    72,689,812.80/109,034,719.20 = 52,282,478.40/x
  3. Step 3: Cross multiply
    72,689,812.80x = 109,034,719.20 × 52,282,478.40
  4. Step 4: Simplify right side
    72,689,812.80x = 5,700,605,351,424,065
  5. Step 5: Solve for x
    x = 5,700,605,351,424,065/72,689,812.80
  6. Step 6: Final answer
    x = 78,423,717.60

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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.