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Finding the Fourth Proportional to 938.67, 1,292.13 and 813.60

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Solution

The fourth proportional to 938.67, 1,292.13 and 813.60 is: 1,119.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    938.67 : 1,292.13 = 813.60 : x
  2. Step 2: Convert to fraction form
    938.67/1,292.13 = 813.60/x
  3. Step 3: Cross multiply
    938.67x = 1,292.13 × 813.60
  4. Step 4: Simplify right side
    938.67x = 1,051,276.97
  5. Step 5: Solve for x
    x = 1,051,276.97/938.67
  6. Step 6: Final answer
    x = 1,119.96

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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.