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Finding the Fourth Proportional to 1,542.68, 2,128.82 and 870.47

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Solution

The fourth proportional to 1,542.68, 2,128.82 and 870.47 is: 1,201.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,542.68 : 2,128.82 = 870.47 : x
  2. Step 2: Convert to fraction form
    1,542.68/2,128.82 = 870.47/x
  3. Step 3: Cross multiply
    1,542.68x = 2,128.82 × 870.47
  4. Step 4: Simplify right side
    1,542.68x = 1,853,058.95
  5. Step 5: Solve for x
    x = 1,853,058.95/1,542.68
  6. Step 6: Final answer
    x = 1,201.20

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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.