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Finding the Fourth Proportional to 717.06, 990.32 and 577.64

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Solution

The fourth proportional to 717.06, 990.32 and 577.64 is: 797.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    717.06 : 990.32 = 577.64 : x
  2. Step 2: Convert to fraction form
    717.06/990.32 = 577.64/x
  3. Step 3: Cross multiply
    717.06x = 990.32 × 577.64
  4. Step 4: Simplify right side
    717.06x = 572,040.61
  5. Step 5: Solve for x
    x = 572,040.61/717.06
  6. Step 6: Final answer
    x = 797.76

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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.