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Finding the Fourth Proportional to 316.52, 472 and 287.90

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Solution

The fourth proportional to 316.52, 472 and 287.90 is: 429.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    316.52 : 472 = 287.90 : x
  2. Step 2: Convert to fraction form
    316.52/472 = 287.90/x
  3. Step 3: Cross multiply
    316.52x = 472 × 287.90
  4. Step 4: Simplify right side
    316.52x = 135,888.80
  5. Step 5: Solve for x
    x = 135,888.80/316.52
  6. Step 6: Final answer
    x = 429.32

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.