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Finding the Fourth Proportional to 401.72, 553.08 and 342.32

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Solution

The fourth proportional to 401.72, 553.08 and 342.32 is: 471.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    401.72 : 553.08 = 342.32 : x
  2. Step 2: Convert to fraction form
    401.72/553.08 = 342.32/x
  3. Step 3: Cross multiply
    401.72x = 553.08 × 342.32
  4. Step 4: Simplify right side
    401.72x = 189,330.35
  5. Step 5: Solve for x
    x = 189,330.35/401.72
  6. Step 6: Final answer
    x = 471.30

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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.