Home / 1,456.40-2,181.36-1,129.20

Finding the Fourth Proportional to 1,456.40, 2,181.36 and 1,129.20

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Solution

The fourth proportional to 1,456.40, 2,181.36 and 1,129.20 is: 1,691.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,456.40 : 2,181.36 = 1,129.20 : x
  2. Step 2: Convert to fraction form
    1,456.40/2,181.36 = 1,129.20/x
  3. Step 3: Cross multiply
    1,456.40x = 2,181.36 × 1,129.20
  4. Step 4: Simplify right side
    1,456.40x = 2,463,191.71
  5. Step 5: Solve for x
    x = 2,463,191.71/1,456.40
  6. Step 6: Final answer
    x = 1,691.29

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.