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Finding the Fourth Proportional to 1,541.72, 2,127.28 and 878.32

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Solution

The fourth proportional to 1,541.72, 2,127.28 and 878.32 is: 1,211.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,541.72 : 2,127.28 = 878.32 : x
  2. Step 2: Convert to fraction form
    1,541.72/2,127.28 = 878.32/x
  3. Step 3: Cross multiply
    1,541.72x = 2,127.28 × 878.32
  4. Step 4: Simplify right side
    1,541.72x = 1,868,432.57
  5. Step 5: Solve for x
    x = 1,868,432.57/1,541.72
  6. Step 6: Final answer
    x = 1,211.91

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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.