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Finding the Fourth Proportional to 793.68, 1,187.64 and 655.44

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Solution

The fourth proportional to 793.68, 1,187.64 and 655.44 is: 980.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    793.68 : 1,187.64 = 655.44 : x
  2. Step 2: Convert to fraction form
    793.68/1,187.64 = 655.44/x
  3. Step 3: Cross multiply
    793.68x = 1,187.64 × 655.44
  4. Step 4: Simplify right side
    793.68x = 778,426.76
  5. Step 5: Solve for x
    x = 778,426.76/793.68
  6. Step 6: Final answer
    x = 980.78

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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.