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Finding the Fourth Proportional to 789.40, 1,087.80 and 614.44

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Solution

The fourth proportional to 789.40, 1,087.80 and 614.44 is: 846.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    789.40 : 1,087.80 = 614.44 : x
  2. Step 2: Convert to fraction form
    789.40/1,087.80 = 614.44/x
  3. Step 3: Cross multiply
    789.40x = 1,087.80 × 614.44
  4. Step 4: Simplify right side
    789.40x = 668,387.83
  5. Step 5: Solve for x
    x = 668,387.83/789.40
  6. Step 6: Final answer
    x = 846.70

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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.