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Finding the Fourth Proportional to 1,691.16, 2,334.42 and 993.12

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Solution

The fourth proportional to 1,691.16, 2,334.42 and 993.12 is: 1,370.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,691.16 : 2,334.42 = 993.12 : x
  2. Step 2: Convert to fraction form
    1,691.16/2,334.42 = 993.12/x
  3. Step 3: Cross multiply
    1,691.16x = 2,334.42 × 993.12
  4. Step 4: Simplify right side
    1,691.16x = 2,318,359.19
  5. Step 5: Solve for x
    x = 2,318,359.19/1,691.16
  6. Step 6: Final answer
    x = 1,370.87

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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.