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Finding the Fourth Proportional to 90,872.40, 136,454.40 and 61,420.80

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Solution

The fourth proportional to 90,872.40, 136,454.40 and 61,420.80 is: 92,229.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,872.40 : 136,454.40 = 61,420.80 : x
  2. Step 2: Convert to fraction form
    90,872.40/136,454.40 = 61,420.80/x
  3. Step 3: Cross multiply
    90,872.40x = 136,454.40 × 61,420.80
  4. Step 4: Simplify right side
    90,872.40x = 8,381,138,411.52
  5. Step 5: Solve for x
    x = 8,381,138,411.52/90,872.40
  6. Step 6: Final answer
    x = 92,229.75

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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.