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Finding the Fourth Proportional to 287.68, 431.46 and 125.32

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Solution

The fourth proportional to 287.68, 431.46 and 125.32 is: 187.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.68 : 431.46 = 125.32 : x
  2. Step 2: Convert to fraction form
    287.68/431.46 = 125.32/x
  3. Step 3: Cross multiply
    287.68x = 431.46 × 125.32
  4. Step 4: Simplify right side
    287.68x = 54,070.57
  5. Step 5: Solve for x
    x = 54,070.57/287.68
  6. Step 6: Final answer
    x = 187.95

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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.