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Finding the Fourth Proportional to 91,312.97, 136,982.43 and 28,138.23

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Solution

The fourth proportional to 91,312.97, 136,982.43 and 28,138.23 is: 42,211.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,312.97 : 136,982.43 = 28,138.23 : x
  2. Step 2: Convert to fraction form
    91,312.97/136,982.43 = 28,138.23/x
  3. Step 3: Cross multiply
    91,312.97x = 136,982.43 × 28,138.23
  4. Step 4: Simplify right side
    91,312.97x = 3,854,443,121.30
  5. Step 5: Solve for x
    x = 3,854,443,121.30/91,312.97
  6. Step 6: Final answer
    x = 42,211.35

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1.5x scale

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.