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Finding the Fourth Proportional to 90,752.64, 136,129.02 and 28,428

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Solution

The fourth proportional to 90,752.64, 136,129.02 and 28,428 is: 42,642.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,752.64 : 136,129.02 = 28,428 : x
  2. Step 2: Convert to fraction form
    90,752.64/136,129.02 = 28,428/x
  3. Step 3: Cross multiply
    90,752.64x = 136,129.02 × 28,428
  4. Step 4: Simplify right side
    90,752.64x = 3,869,875,780.56
  5. Step 5: Solve for x
    x = 3,869,875,780.56/90,752.64
  6. Step 6: Final answer
    x = 42,642.02

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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.