Home / 1,587.90-2,191.30-889.28

Finding the Fourth Proportional to 1,587.90, 2,191.30 and 889.28

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Solution

The fourth proportional to 1,587.90, 2,191.30 and 889.28 is: 1,227.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,587.90 : 2,191.30 = 889.28 : x
  2. Step 2: Convert to fraction form
    1,587.90/2,191.30 = 889.28/x
  3. Step 3: Cross multiply
    1,587.90x = 2,191.30 × 889.28
  4. Step 4: Simplify right side
    1,587.90x = 1,948,679.26
  5. Step 5: Solve for x
    x = 1,948,679.26/1,587.90
  6. Step 6: Final answer
    x = 1,227.21

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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.