Home / 1,542.40-2,127.68-921.28

Finding the Fourth Proportional to 1,542.40, 2,127.68 and 921.28

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Solution

The fourth proportional to 1,542.40, 2,127.68 and 921.28 is: 1,270.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,542.40 : 2,127.68 = 921.28 : x
  2. Step 2: Convert to fraction form
    1,542.40/2,127.68 = 921.28/x
  3. Step 3: Cross multiply
    1,542.40x = 2,127.68 × 921.28
  4. Step 4: Simplify right side
    1,542.40x = 1,960,189.03
  5. Step 5: Solve for x
    x = 1,960,189.03/1,542.40
  6. Step 6: Final answer
    x = 1,270.87

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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.