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Finding the Fourth Proportional to 400.80, 552.80 and 253.38

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Solution

The fourth proportional to 400.80, 552.80 and 253.38 is: 349.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    400.80 : 552.80 = 253.38 : x
  2. Step 2: Convert to fraction form
    400.80/552.80 = 253.38/x
  3. Step 3: Cross multiply
    400.80x = 552.80 × 253.38
  4. Step 4: Simplify right side
    400.80x = 140,068.46
  5. Step 5: Solve for x
    x = 140,068.46/400.80
  6. Step 6: Final answer
    x = 349.47

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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.