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Finding the Fourth Proportional to 1,518.75, 2,278.13 and 871.16

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Solution

The fourth proportional to 1,518.75, 2,278.13 and 871.16 is: 1,306.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,518.75 : 2,278.13 = 871.16 : x
  2. Step 2: Convert to fraction form
    1,518.75/2,278.13 = 871.16/x
  3. Step 3: Cross multiply
    1,518.75x = 2,278.13 × 871.16
  4. Step 4: Simplify right side
    1,518.75x = 1,984,599.98
  5. Step 5: Solve for x
    x = 1,984,599.98/1,518.75
  6. Step 6: Final answer
    x = 1,306.73

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1.5x scale

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.