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Finding the Fourth Proportional to 80,759.64, 121,155.68 and 28,155

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Solution

The fourth proportional to 80,759.64, 121,155.68 and 28,155 is: 42,238.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,759.64 : 121,155.68 = 28,155 : x
  2. Step 2: Convert to fraction form
    80,759.64/121,155.68 = 28,155/x
  3. Step 3: Cross multiply
    80,759.64x = 121,155.68 × 28,155
  4. Step 4: Simplify right side
    80,759.64x = 3,411,138,170.40
  5. Step 5: Solve for x
    x = 3,411,138,170.40/80,759.64
  6. Step 6: Final answer
    x = 42,238.15

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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.