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Finding the Fourth Proportional to 317.72, 473.96 and 266.70

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Solution

The fourth proportional to 317.72, 473.96 and 266.70 is: 397.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    317.72 : 473.96 = 266.70 : x
  2. Step 2: Convert to fraction form
    317.72/473.96 = 266.70/x
  3. Step 3: Cross multiply
    317.72x = 473.96 × 266.70
  4. Step 4: Simplify right side
    317.72x = 126,405.13
  5. Step 5: Solve for x
    x = 126,405.13/317.72
  6. Step 6: Final answer
    x = 397.85

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.