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Finding the Fourth Proportional to 1,587.90, 2,191.20 and 889.32

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Solution

The fourth proportional to 1,587.90, 2,191.20 and 889.32 is: 1,227.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,587.90 : 2,191.20 = 889.32 : x
  2. Step 2: Convert to fraction form
    1,587.90/2,191.20 = 889.32/x
  3. Step 3: Cross multiply
    1,587.90x = 2,191.20 × 889.32
  4. Step 4: Simplify right side
    1,587.90x = 1,948,677.98
  5. Step 5: Solve for x
    x = 1,948,677.98/1,587.90
  6. Step 6: Final answer
    x = 1,227.20

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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.