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Finding the Fourth Proportional to 711.52, 980.00 and 618.37

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Solution

The fourth proportional to 711.52, 980.00 and 618.37 is: 851.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    711.52 : 980.00 = 618.37 : x
  2. Step 2: Convert to fraction form
    711.52/980.00 = 618.37/x
  3. Step 3: Cross multiply
    711.52x = 980.00 × 618.37
  4. Step 4: Simplify right side
    711.52x = 605,999.38
  5. Step 5: Solve for x
    x = 605,999.38/711.52
  6. Step 6: Final answer
    x = 851.70

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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.