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Finding the Fourth Proportional to 1,542.20, 2,128 and 879.08

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Solution

The fourth proportional to 1,542.20, 2,128 and 879.08 is: 1,213.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,542.20 : 2,128 = 879.08 : x
  2. Step 2: Convert to fraction form
    1,542.20/2,128 = 879.08/x
  3. Step 3: Cross multiply
    1,542.20x = 2,128 × 879.08
  4. Step 4: Simplify right side
    1,542.20x = 1,870,682.24
  5. Step 5: Solve for x
    x = 1,870,682.24/1,542.20
  6. Step 6: Final answer
    x = 1,213.00

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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.