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Finding the Fourth Proportional to 1,587.75, 2,191.05 and 889.13

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Solution

The fourth proportional to 1,587.75, 2,191.05 and 889.13 is: 1,226.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,587.75 : 2,191.05 = 889.13 : x
  2. Step 2: Convert to fraction form
    1,587.75/2,191.05 = 889.13/x
  3. Step 3: Cross multiply
    1,587.75x = 2,191.05 × 889.13
  4. Step 4: Simplify right side
    1,587.75x = 1,948,121.44
  5. Step 5: Solve for x
    x = 1,948,121.44/1,587.75
  6. Step 6: Final answer
    x = 1,226.97

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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.