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Finding the Fourth Proportional to 90,336.42, 135,356.80 and 54,689.69

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Solution

The fourth proportional to 90,336.42, 135,356.80 and 54,689.69 is: 81,945.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,336.42 : 135,356.80 = 54,689.69 : x
  2. Step 2: Convert to fraction form
    90,336.42/135,356.80 = 54,689.69/x
  3. Step 3: Cross multiply
    90,336.42x = 135,356.80 × 54,689.69
  4. Step 4: Simplify right side
    90,336.42x = 7,402,621,431.39
  5. Step 5: Solve for x
    x = 7,402,621,431.39/90,336.42
  6. Step 6: Final answer
    x = 81,945.04

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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.