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Finding the Fourth Proportional to 456.79, 685.10 and 148.60

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Solution

The fourth proportional to 456.79, 685.10 and 148.60 is: 222.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    456.79 : 685.10 = 148.60 : x
  2. Step 2: Convert to fraction form
    456.79/685.10 = 148.60/x
  3. Step 3: Cross multiply
    456.79x = 685.10 × 148.60
  4. Step 4: Simplify right side
    456.79x = 101,802.43
  5. Step 5: Solve for x
    x = 101,802.43/456.79
  6. Step 6: Final answer
    x = 222.86

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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.