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Finding the Fourth Proportional to 90,658.61, 135,987.89 and 28,329.11

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Solution

The fourth proportional to 90,658.61, 135,987.89 and 28,329.11 is: 42,493.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,658.61 : 135,987.89 = 28,329.11 : x
  2. Step 2: Convert to fraction form
    90,658.61/135,987.89 = 28,329.11/x
  3. Step 3: Cross multiply
    90,658.61x = 135,987.89 × 28,329.11
  4. Step 4: Simplify right side
    90,658.61x = 3,852,415,894.48
  5. Step 5: Solve for x
    x = 3,852,415,894.48/90,658.61
  6. Step 6: Final answer
    x = 42,493.66

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Similar ratio
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1.5x scale

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.