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Finding the Fourth Proportional to 1,587.70, 2,191 and 889.08

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Solution

The fourth proportional to 1,587.70, 2,191 and 889.08 is: 1,226.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,587.70 : 2,191 = 889.08 : x
  2. Step 2: Convert to fraction form
    1,587.70/2,191 = 889.08/x
  3. Step 3: Cross multiply
    1,587.70x = 2,191 × 889.08
  4. Step 4: Simplify right side
    1,587.70x = 1,947,974.28
  5. Step 5: Solve for x
    x = 1,947,974.28/1,587.70
  6. Step 6: Final answer
    x = 1,226.92

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Double scale
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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.