Home / 1,291.92-1,781.64-1,116.24

Finding the Fourth Proportional to 1,291.92, 1,781.64 and 1,116.24

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Solution

The fourth proportional to 1,291.92, 1,781.64 and 1,116.24 is: 1,539.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,291.92 : 1,781.64 = 1,116.24 : x
  2. Step 2: Convert to fraction form
    1,291.92/1,781.64 = 1,116.24/x
  3. Step 3: Cross multiply
    1,291.92x = 1,781.64 × 1,116.24
  4. Step 4: Simplify right side
    1,291.92x = 1,988,737.83
  5. Step 5: Solve for x
    x = 1,988,737.83/1,291.92
  6. Step 6: Final answer
    x = 1,539.37

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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.