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Finding the Fourth Proportional to 456.71, 685.15 and 148.55

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Solution

The fourth proportional to 456.71, 685.15 and 148.55 is: 222.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    456.71 : 685.15 = 148.55 : x
  2. Step 2: Convert to fraction form
    456.71/685.15 = 148.55/x
  3. Step 3: Cross multiply
    456.71x = 685.15 × 148.55
  4. Step 4: Simplify right side
    456.71x = 101,775.24
  5. Step 5: Solve for x
    x = 101,775.24/456.71
  6. Step 6: Final answer
    x = 222.85

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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.