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Finding the Fourth Proportional to 1,577.76, 2,177.19 and 879

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Solution

The fourth proportional to 1,577.76, 2,177.19 and 879 is: 1,212.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,577.76 : 2,177.19 = 879 : x
  2. Step 2: Convert to fraction form
    1,577.76/2,177.19 = 879/x
  3. Step 3: Cross multiply
    1,577.76x = 2,177.19 × 879
  4. Step 4: Simplify right side
    1,577.76x = 1,913,750.01
  5. Step 5: Solve for x
    x = 1,913,750.01/1,577.76
  6. Step 6: Final answer
    x = 1,212.95

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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.