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Finding the Fourth Proportional to 90,788.71, 136,204.95 and 28,459.21

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Solution

The fourth proportional to 90,788.71, 136,204.95 and 28,459.21 is: 42,695.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,788.71 : 136,204.95 = 28,459.21 : x
  2. Step 2: Convert to fraction form
    90,788.71/136,204.95 = 28,459.21/x
  3. Step 3: Cross multiply
    90,788.71x = 136,204.95 × 28,459.21
  4. Step 4: Simplify right side
    90,788.71x = 3,876,285,275.09
  5. Step 5: Solve for x
    x = 3,876,285,275.09/90,788.71
  6. Step 6: Final answer
    x = 42,695.68

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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.