Home / 1,781.76-2,456.40-1,317.12

Finding the Fourth Proportional to 1,781.76, 2,456.40 and 1,317.12

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Solution

The fourth proportional to 1,781.76, 2,456.40 and 1,317.12 is: 1,815.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,781.76 : 2,456.40 = 1,317.12 : x
  2. Step 2: Convert to fraction form
    1,781.76/2,456.40 = 1,317.12/x
  3. Step 3: Cross multiply
    1,781.76x = 2,456.40 × 1,317.12
  4. Step 4: Simplify right side
    1,781.76x = 3,235,373.57
  5. Step 5: Solve for x
    x = 3,235,373.57/1,781.76
  6. Step 6: Final answer
    x = 1,815.83

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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.