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Finding the Fourth Proportional to 1,577.28, 2,176.74 and 878.76

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Solution

The fourth proportional to 1,577.28, 2,176.74 and 878.76 is: 1,212.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,577.28 : 2,176.74 = 878.76 : x
  2. Step 2: Convert to fraction form
    1,577.28/2,176.74 = 878.76/x
  3. Step 3: Cross multiply
    1,577.28x = 2,176.74 × 878.76
  4. Step 4: Simplify right side
    1,577.28x = 1,912,832.04
  5. Step 5: Solve for x
    x = 1,912,832.04/1,577.28
  6. Step 6: Final answer
    x = 1,212.74

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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.