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Finding the Fourth Proportional to 711.33, 980.61 and 553.68

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Solution

The fourth proportional to 711.33, 980.61 and 553.68 is: 763.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    711.33 : 980.61 = 553.68 : x
  2. Step 2: Convert to fraction form
    711.33/980.61 = 553.68/x
  3. Step 3: Cross multiply
    711.33x = 980.61 × 553.68
  4. Step 4: Simplify right side
    711.33x = 542,944.14
  5. Step 5: Solve for x
    x = 542,944.14/711.33
  6. Step 6: Final answer
    x = 763.28

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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.