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Finding the Fourth Proportional to 457.18, 685.60 and 320.15

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Solution

The fourth proportional to 457.18, 685.60 and 320.15 is: 480.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    457.18 : 685.60 = 320.15 : x
  2. Step 2: Convert to fraction form
    457.18/685.60 = 320.15/x
  3. Step 3: Cross multiply
    457.18x = 685.60 × 320.15
  4. Step 4: Simplify right side
    457.18x = 219,495.75
  5. Step 5: Solve for x
    x = 219,495.75/457.18
  6. Step 6: Final answer
    x = 480.11

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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.