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Finding the Fourth Proportional to 461.48, 691.94 and 317.40

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Solution

The fourth proportional to 461.48, 691.94 and 317.40 is: 475.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    461.48 : 691.94 = 317.40 : x
  2. Step 2: Convert to fraction form
    461.48/691.94 = 317.40/x
  3. Step 3: Cross multiply
    461.48x = 691.94 × 317.40
  4. Step 4: Simplify right side
    461.48x = 219,621.76
  5. Step 5: Solve for x
    x = 219,621.76/461.48
  6. Step 6: Final answer
    x = 475.91

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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.