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Finding the Fourth Proportional to 90,388, 135,629.28 and 65,632.52

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Solution

The fourth proportional to 90,388, 135,629.28 and 65,632.52 is: 98,483.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,388 : 135,629.28 = 65,632.52 : x
  2. Step 2: Convert to fraction form
    90,388/135,629.28 = 65,632.52/x
  3. Step 3: Cross multiply
    90,388x = 135,629.28 × 65,632.52
  4. Step 4: Simplify right side
    90,388x = 8,901,691,432.19
  5. Step 5: Solve for x
    x = 8,901,691,432.19/90,388
  6. Step 6: Final answer
    x = 98,483.11

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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.