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Finding the Fourth Proportional to 65,729.72, 90,706.92 and 38,885.42

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Solution

The fourth proportional to 65,729.72, 90,706.92 and 38,885.42 is: 53,661.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,729.72 : 90,706.92 = 38,885.42 : x
  2. Step 2: Convert to fraction form
    65,729.72/90,706.92 = 38,885.42/x
  3. Step 3: Cross multiply
    65,729.72x = 90,706.92 × 38,885.42
  4. Step 4: Simplify right side
    65,729.72x = 3,527,176,681.11
  5. Step 5: Solve for x
    x = 3,527,176,681.11/65,729.72
  6. Step 6: Final answer
    x = 53,661.82

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1.5x scale

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.