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Finding the Fourth Proportional to 316.15, 474.31 and 142.87

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Solution

The fourth proportional to 316.15, 474.31 and 142.87 is: 214.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    316.15 : 474.31 = 142.87 : x
  2. Step 2: Convert to fraction form
    316.15/474.31 = 142.87/x
  3. Step 3: Cross multiply
    316.15x = 474.31 × 142.87
  4. Step 4: Simplify right side
    316.15x = 67,764.67
  5. Step 5: Solve for x
    x = 67,764.67/316.15
  6. Step 6: Final answer
    x = 214.34

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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.