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Finding the Fourth Proportional to 66,434.79, 91,668.74 and 38,139.87

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Solution

The fourth proportional to 66,434.79, 91,668.74 and 38,139.87 is: 52,626.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,434.79 : 91,668.74 = 38,139.87 : x
  2. Step 2: Convert to fraction form
    66,434.79/91,668.74 = 38,139.87/x
  3. Step 3: Cross multiply
    66,434.79x = 91,668.74 × 38,139.87
  4. Step 4: Simplify right side
    66,434.79x = 3,496,233,635.96
  5. Step 5: Solve for x
    x = 3,496,233,635.96/66,434.79
  6. Step 6: Final answer
    x = 52,626.55

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.