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Finding the Fourth Proportional to 21,998,981.70, 32,998,472.55 and 20,505,989.70

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Solution

The fourth proportional to 21,998,981.70, 32,998,472.55 and 20,505,989.70 is: 30,758,984.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,998,981.70 : 32,998,472.55 = 20,505,989.70 : x
  2. Step 2: Convert to fraction form
    21,998,981.70/32,998,472.55 = 20,505,989.70/x
  3. Step 3: Cross multiply
    21,998,981.70x = 32,998,472.55 × 20,505,989.70
  4. Step 4: Simplify right side
    21,998,981.70x = 676,666,338,226,032.75
  5. Step 5: Solve for x
    x = 676,666,338,226,032.75/21,998,981.70
  6. Step 6: Final answer
    x = 30,758,984.55

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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.