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Finding the Fourth Proportional to 20,762,613.90, 31,134,589.65 and 7,978,869.90

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Solution

The fourth proportional to 20,762,613.90, 31,134,589.65 and 7,978,869.90 is: 11,964,718.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,762,613.90 : 31,134,589.65 = 7,978,869.90 : x
  2. Step 2: Convert to fraction form
    20,762,613.90/31,134,589.65 = 7,978,869.90/x
  3. Step 3: Cross multiply
    20,762,613.90x = 31,134,589.65 × 7,978,869.90
  4. Step 4: Simplify right side
    20,762,613.90x = 248,418,840,207,236.53
  5. Step 5: Solve for x
    x = 248,418,840,207,236.53/20,762,613.90
  6. Step 6: Final answer
    x = 11,964,718.96

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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.