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Finding the Fourth Proportional to 90,663, 135,999.36 and 28,338.36

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Solution

The fourth proportional to 90,663, 135,999.36 and 28,338.36 is: 42,509.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,663 : 135,999.36 = 28,338.36 : x
  2. Step 2: Convert to fraction form
    90,663/135,999.36 = 28,338.36/x
  3. Step 3: Cross multiply
    90,663x = 135,999.36 × 28,338.36
  4. Step 4: Simplify right side
    90,663x = 3,853,998,823.45
  5. Step 5: Solve for x
    x = 3,853,998,823.45/90,663
  6. Step 6: Final answer
    x = 42,509.06

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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.