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Finding the Fourth Proportional to 972.81, 1,342.52 and 553.20

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Solution

The fourth proportional to 972.81, 1,342.52 and 553.20 is: 763.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    972.81 : 1,342.52 = 553.20 : x
  2. Step 2: Convert to fraction form
    972.81/1,342.52 = 553.20/x
  3. Step 3: Cross multiply
    972.81x = 1,342.52 × 553.20
  4. Step 4: Simplify right side
    972.81x = 742,687.44
  5. Step 5: Solve for x
    x = 742,687.44/972.81
  6. Step 6: Final answer
    x = 763.44

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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.