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Finding the Fourth Proportional to 74,700.90, 112,065.12 and 21,390.62

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Solution

The fourth proportional to 74,700.90, 112,065.12 and 21,390.62 is: 32,089.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    74,700.90 : 112,065.12 = 21,390.62 : x
  2. Step 2: Convert to fraction form
    74,700.90/112,065.12 = 21,390.62/x
  3. Step 3: Cross multiply
    74,700.90x = 112,065.12 × 21,390.62
  4. Step 4: Simplify right side
    74,700.90x = 2,397,141,836.85
  5. Step 5: Solve for x
    x = 2,397,141,836.85/74,700.90
  6. Step 6: Final answer
    x = 32,089.87

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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.