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Finding the Fourth Proportional to 1,541.78, 2,127.60 and 878.79

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Solution

The fourth proportional to 1,541.78, 2,127.60 and 878.79 is: 1,212.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,541.78 : 2,127.60 = 878.79 : x
  2. Step 2: Convert to fraction form
    1,541.78/2,127.60 = 878.79/x
  3. Step 3: Cross multiply
    1,541.78x = 2,127.60 × 878.79
  4. Step 4: Simplify right side
    1,541.78x = 1,869,713.60
  5. Step 5: Solve for x
    x = 1,869,713.60/1,541.78
  6. Step 6: Final answer
    x = 1,212.70

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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.