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Finding the Fourth Proportional to 90,757.64, 136,136.52 and 28,433

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Solution

The fourth proportional to 90,757.64, 136,136.52 and 28,433 is: 42,649.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,757.64 : 136,136.52 = 28,433 : x
  2. Step 2: Convert to fraction form
    90,757.64/136,136.52 = 28,433/x
  3. Step 3: Cross multiply
    90,757.64x = 136,136.52 × 28,433
  4. Step 4: Simplify right side
    90,757.64x = 3,870,769,673.16
  5. Step 5: Solve for x
    x = 3,870,769,673.16/90,757.64
  6. Step 6: Final answer
    x = 42,649.52

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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.