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Finding the Fourth Proportional to 972.85, 1,342.56 and 553.15

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Solution

The fourth proportional to 972.85, 1,342.56 and 553.15 is: 763.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    972.85 : 1,342.56 = 553.15 : x
  2. Step 2: Convert to fraction form
    972.85/1,342.56 = 553.15/x
  3. Step 3: Cross multiply
    972.85x = 1,342.56 × 553.15
  4. Step 4: Simplify right side
    972.85x = 742,637.06
  5. Step 5: Solve for x
    x = 742,637.06/972.85
  6. Step 6: Final answer
    x = 763.36

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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.