Home / 1,118.20-1,542.36-921.40

Finding the Fourth Proportional to 1,118.20, 1,542.36 and 921.40

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Solution

The fourth proportional to 1,118.20, 1,542.36 and 921.40 is: 1,270.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,118.20 : 1,542.36 = 921.40 : x
  2. Step 2: Convert to fraction form
    1,118.20/1,542.36 = 921.40/x
  3. Step 3: Cross multiply
    1,118.20x = 1,542.36 × 921.40
  4. Step 4: Simplify right side
    1,118.20x = 1,421,130.50
  5. Step 5: Solve for x
    x = 1,421,130.50/1,118.20
  6. Step 6: Final answer
    x = 1,270.91

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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.