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Finding the Fourth Proportional to 400.62, 551.88 and 317.70

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Solution

The fourth proportional to 400.62, 551.88 and 317.70 is: 437.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    400.62 : 551.88 = 317.70 : x
  2. Step 2: Convert to fraction form
    400.62/551.88 = 317.70/x
  3. Step 3: Cross multiply
    400.62x = 551.88 × 317.70
  4. Step 4: Simplify right side
    400.62x = 175,332.28
  5. Step 5: Solve for x
    x = 175,332.28/400.62
  6. Step 6: Final answer
    x = 437.65

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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.