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Finding the Fourth Proportional to 66,381.51, 99,582.08 and 21,387.78

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Solution

The fourth proportional to 66,381.51, 99,582.08 and 21,387.78 is: 32,084.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,381.51 : 99,582.08 = 21,387.78 : x
  2. Step 2: Convert to fraction form
    66,381.51/99,582.08 = 21,387.78/x
  3. Step 3: Cross multiply
    66,381.51x = 99,582.08 × 21,387.78
  4. Step 4: Simplify right side
    66,381.51x = 2,129,839,618.98
  5. Step 5: Solve for x
    x = 2,129,839,618.98/66,381.51
  6. Step 6: Final answer
    x = 32,084.83

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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.