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Finding the Fourth Proportional to 316.47, 474.71 and 85.36

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Solution

The fourth proportional to 316.47, 474.71 and 85.36 is: 128.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    316.47 : 474.71 = 85.36 : x
  2. Step 2: Convert to fraction form
    316.47/474.71 = 85.36/x
  3. Step 3: Cross multiply
    316.47x = 474.71 × 85.36
  4. Step 4: Simplify right side
    316.47x = 40,521.25
  5. Step 5: Solve for x
    x = 40,521.25/316.47
  6. Step 6: Final answer
    x = 128.04

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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.