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Finding the Fourth Proportional to 716.88, 990.18 and 618.60

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Solution

The fourth proportional to 716.88, 990.18 and 618.60 is: 854.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    716.88 : 990.18 = 618.60 : x
  2. Step 2: Convert to fraction form
    716.88/990.18 = 618.60/x
  3. Step 3: Cross multiply
    716.88x = 990.18 × 618.60
  4. Step 4: Simplify right side
    716.88x = 612,525.35
  5. Step 5: Solve for x
    x = 612,525.35/716.88
  6. Step 6: Final answer
    x = 854.43

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1.5x scale

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.