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Finding the Fourth Proportional to 717.06, 987.09 and 618.24

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Solution

The fourth proportional to 717.06, 987.09 and 618.24 is: 851.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    717.06 : 987.09 = 618.24 : x
  2. Step 2: Convert to fraction form
    717.06/987.09 = 618.24/x
  3. Step 3: Cross multiply
    717.06x = 987.09 × 618.24
  4. Step 4: Simplify right side
    717.06x = 610,258.52
  5. Step 5: Solve for x
    x = 610,258.52/717.06
  6. Step 6: Final answer
    x = 851.06

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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.