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Finding the Fourth Proportional to 400.32, 552.40 and 253.12

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Solution

The fourth proportional to 400.32, 552.40 and 253.12 is: 349.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    400.32 : 552.40 = 253.12 : x
  2. Step 2: Convert to fraction form
    400.32/552.40 = 253.12/x
  3. Step 3: Cross multiply
    400.32x = 552.40 × 253.12
  4. Step 4: Simplify right side
    400.32x = 139,823.49
  5. Step 5: Solve for x
    x = 139,823.49/400.32
  6. Step 6: Final answer
    x = 349.28

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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.