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Finding the Fourth Proportional to 1,542.29, 2,128.22 and 878.98

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Solution

The fourth proportional to 1,542.29, 2,128.22 and 878.98 is: 1,212.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,542.29 : 2,128.22 = 878.98 : x
  2. Step 2: Convert to fraction form
    1,542.29/2,128.22 = 878.98/x
  3. Step 3: Cross multiply
    1,542.29x = 2,128.22 × 878.98
  4. Step 4: Simplify right side
    1,542.29x = 1,870,659.35
  5. Step 5: Solve for x
    x = 1,870,659.35/1,542.29
  6. Step 6: Final answer
    x = 1,212.91

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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.