Home / 1,587.68-2,191.20-889.28

Finding the Fourth Proportional to 1,587.68, 2,191.20 and 889.28

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Solution

The fourth proportional to 1,587.68, 2,191.20 and 889.28 is: 1,227.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,587.68 : 2,191.20 = 889.28 : x
  2. Step 2: Convert to fraction form
    1,587.68/2,191.20 = 889.28/x
  3. Step 3: Cross multiply
    1,587.68x = 2,191.20 × 889.28
  4. Step 4: Simplify right side
    1,587.68x = 1,948,590.34
  5. Step 5: Solve for x
    x = 1,948,590.34/1,587.68
  6. Step 6: Final answer
    x = 1,227.32

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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.