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Finding the Fourth Proportional to 90,748.80, 136,123.20 and 51,382.80

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Solution

The fourth proportional to 90,748.80, 136,123.20 and 51,382.80 is: 77,074.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,748.80 : 136,123.20 = 51,382.80 : x
  2. Step 2: Convert to fraction form
    90,748.80/136,123.20 = 51,382.80/x
  3. Step 3: Cross multiply
    90,748.80x = 136,123.20 × 51,382.80
  4. Step 4: Simplify right side
    90,748.80x = 6,994,391,160.96
  5. Step 5: Solve for x
    x = 6,994,391,160.96/90,748.80
  6. Step 6: Final answer
    x = 77,074.20

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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.