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Finding the Fourth Proportional to 317.61, 474.17 and 315.32

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Solution

The fourth proportional to 317.61, 474.17 and 315.32 is: 470.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    317.61 : 474.17 = 315.32 : x
  2. Step 2: Convert to fraction form
    317.61/474.17 = 315.32/x
  3. Step 3: Cross multiply
    317.61x = 474.17 × 315.32
  4. Step 4: Simplify right side
    317.61x = 149,511.34
  5. Step 5: Solve for x
    x = 149,511.34/317.61
  6. Step 6: Final answer
    x = 470.74

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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.