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Finding the Fourth Proportional to 316.78, 474.85 and 152.20

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Solution

The fourth proportional to 316.78, 474.85 and 152.20 is: 228.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    316.78 : 474.85 = 152.20 : x
  2. Step 2: Convert to fraction form
    316.78/474.85 = 152.20/x
  3. Step 3: Cross multiply
    316.78x = 474.85 × 152.20
  4. Step 4: Simplify right side
    316.78x = 72,272.17
  5. Step 5: Solve for x
    x = 72,272.17/316.78
  6. Step 6: Final answer
    x = 228.15

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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.