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Finding the Fourth Proportional to 287.90, 431.76 and 114.52

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Solution

The fourth proportional to 287.90, 431.76 and 114.52 is: 171.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.90 : 431.76 = 114.52 : x
  2. Step 2: Convert to fraction form
    287.90/431.76 = 114.52/x
  3. Step 3: Cross multiply
    287.90x = 431.76 × 114.52
  4. Step 4: Simplify right side
    287.90x = 49,445.31
  5. Step 5: Solve for x
    x = 49,445.31/287.90
  6. Step 6: Final answer
    x = 171.74

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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.