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Finding the Fourth Proportional to 972.60, 1,342.17 and 553.04

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Solution

The fourth proportional to 972.60, 1,342.17 and 553.04 is: 763.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    972.60 : 1,342.17 = 553.04 : x
  2. Step 2: Convert to fraction form
    972.60/1,342.17 = 553.04/x
  3. Step 3: Cross multiply
    972.60x = 1,342.17 × 553.04
  4. Step 4: Simplify right side
    972.60x = 742,266.99
  5. Step 5: Solve for x
    x = 742,266.99/972.60
  6. Step 6: Final answer
    x = 763.18

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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.