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Finding the Fourth Proportional to 1,587.78, 2,191.19 and 879.68

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Solution

The fourth proportional to 1,587.78, 2,191.19 and 879.68 is: 1,213.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,587.78 : 2,191.19 = 879.68 : x
  2. Step 2: Convert to fraction form
    1,587.78/2,191.19 = 879.68/x
  3. Step 3: Cross multiply
    1,587.78x = 2,191.19 × 879.68
  4. Step 4: Simplify right side
    1,587.78x = 1,927,530.66
  5. Step 5: Solve for x
    x = 1,927,530.66/1,587.78
  6. Step 6: Final answer
    x = 1,213.98

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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.