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Finding the Fourth Proportional to 972.89, 1,342.65 and 553.28

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Solution

The fourth proportional to 972.89, 1,342.65 and 553.28 is: 763.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    972.89 : 1,342.65 = 553.28 : x
  2. Step 2: Convert to fraction form
    972.89/1,342.65 = 553.28/x
  3. Step 3: Cross multiply
    972.89x = 1,342.65 × 553.28
  4. Step 4: Simplify right side
    972.89x = 742,861.39
  5. Step 5: Solve for x
    x = 742,861.39/972.89
  6. Step 6: Final answer
    x = 763.56

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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.