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Finding the Fourth Proportional to 401.18, 553.40 and 253.76

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Solution

The fourth proportional to 401.18, 553.40 and 253.76 is: 350.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    401.18 : 553.40 = 253.76 : x
  2. Step 2: Convert to fraction form
    401.18/553.40 = 253.76/x
  3. Step 3: Cross multiply
    401.18x = 553.40 × 253.76
  4. Step 4: Simplify right side
    401.18x = 140,430.78
  5. Step 5: Solve for x
    x = 140,430.78/401.18
  6. Step 6: Final answer
    x = 350.04

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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.