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Finding the Fourth Proportional to 20,668,747.80, 31,003,121.70 and 13,488,389.40

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Solution

The fourth proportional to 20,668,747.80, 31,003,121.70 and 13,488,389.40 is: 20,232,584.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,668,747.80 : 31,003,121.70 = 13,488,389.40 : x
  2. Step 2: Convert to fraction form
    20,668,747.80/31,003,121.70 = 13,488,389.40/x
  3. Step 3: Cross multiply
    20,668,747.80x = 31,003,121.70 × 13,488,389.40
  4. Step 4: Simplify right side
    20,668,747.80x = 418,182,178,105,190
  5. Step 5: Solve for x
    x = 418,182,178,105,190/20,668,747.80
  6. Step 6: Final answer
    x = 20,232,584.10

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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.