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Finding the Fourth Proportional to 913.55, 1,260.77 and 789.62

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Solution

The fourth proportional to 913.55, 1,260.77 and 789.62 is: 1,089.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    913.55 : 1,260.77 = 789.62 : x
  2. Step 2: Convert to fraction form
    913.55/1,260.77 = 789.62/x
  3. Step 3: Cross multiply
    913.55x = 1,260.77 × 789.62
  4. Step 4: Simplify right side
    913.55x = 995,518.96
  5. Step 5: Solve for x
    x = 995,518.96/913.55
  6. Step 6: Final answer
    x = 1,089.73

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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.