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Finding the Fourth Proportional to 66,459.40, 99,689.10 and 38,811.40

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Solution

The fourth proportional to 66,459.40, 99,689.10 and 38,811.40 is: 58,217.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,459.40 : 99,689.10 = 38,811.40 : x
  2. Step 2: Convert to fraction form
    66,459.40/99,689.10 = 38,811.40/x
  3. Step 3: Cross multiply
    66,459.40x = 99,689.10 × 38,811.40
  4. Step 4: Simplify right side
    66,459.40x = 3,869,073,535.74
  5. Step 5: Solve for x
    x = 3,869,073,535.74/66,459.40
  6. Step 6: Final answer
    x = 58,217.10

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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.