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Finding the Fourth Proportional to 772.09, 1,158.90 and 657.70

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Solution

The fourth proportional to 772.09, 1,158.90 and 657.70 is: 987.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    772.09 : 1,158.90 = 657.70 : x
  2. Step 2: Convert to fraction form
    772.09/1,158.90 = 657.70/x
  3. Step 3: Cross multiply
    772.09x = 1,158.90 × 657.70
  4. Step 4: Simplify right side
    772.09x = 762,208.53
  5. Step 5: Solve for x
    x = 762,208.53/772.09
  6. Step 6: Final answer
    x = 987.20

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.