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Finding the Fourth Proportional to 732.80, 1,011.20 and 401.20

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Solution

The fourth proportional to 732.80, 1,011.20 and 401.20 is: 553.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    732.80 : 1,011.20 = 401.20 : x
  2. Step 2: Convert to fraction form
    732.80/1,011.20 = 401.20/x
  3. Step 3: Cross multiply
    732.80x = 1,011.20 × 401.20
  4. Step 4: Simplify right side
    732.80x = 405,693.44
  5. Step 5: Solve for x
    x = 405,693.44/732.80
  6. Step 6: Final answer
    x = 553.62

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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.