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Finding the Fourth Proportional to 476.80, 658.16 and 317.32

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Solution

The fourth proportional to 476.80, 658.16 and 317.32 is: 438.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    476.80 : 658.16 = 317.32 : x
  2. Step 2: Convert to fraction form
    476.80/658.16 = 317.32/x
  3. Step 3: Cross multiply
    476.80x = 658.16 × 317.32
  4. Step 4: Simplify right side
    476.80x = 208,847.33
  5. Step 5: Solve for x
    x = 208,847.33/476.80
  6. Step 6: Final answer
    x = 438.02

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.