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Finding the Fourth Proportional to 316.55, 474.71 and 111.06

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Solution

The fourth proportional to 316.55, 474.71 and 111.06 is: 166.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    316.55 : 474.71 = 111.06 : x
  2. Step 2: Convert to fraction form
    316.55/474.71 = 111.06/x
  3. Step 3: Cross multiply
    316.55x = 474.71 × 111.06
  4. Step 4: Simplify right side
    316.55x = 52,721.29
  5. Step 5: Solve for x
    x = 52,721.29/316.55
  6. Step 6: Final answer
    x = 166.55

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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.