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Finding the Fourth Proportional to 72,806,613.80, 109,209,920.70 and 61,327,488.20

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Solution

The fourth proportional to 72,806,613.80, 109,209,920.70 and 61,327,488.20 is: 91,991,232.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,806,613.80 : 109,209,920.70 = 61,327,488.20 : x
  2. Step 2: Convert to fraction form
    72,806,613.80/109,209,920.70 = 61,327,488.20/x
  3. Step 3: Cross multiply
    72,806,613.80x = 109,209,920.70 × 61,327,488.20
  4. Step 4: Simplify right side
    72,806,613.80x = 6,697,570,123,052,186
  5. Step 5: Solve for x
    x = 6,697,570,123,052,186/72,806,613.80
  6. Step 6: Final answer
    x = 91,991,232.30

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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.