Home / 1,531.71-2,298.72-1,121.90

Finding the Fourth Proportional to 1,531.71, 2,298.72 and 1,121.90

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Solution

The fourth proportional to 1,531.71, 2,298.72 and 1,121.90 is: 1,683.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,531.71 : 2,298.72 = 1,121.90 : x
  2. Step 2: Convert to fraction form
    1,531.71/2,298.72 = 1,121.90/x
  3. Step 3: Cross multiply
    1,531.71x = 2,298.72 × 1,121.90
  4. Step 4: Simplify right side
    1,531.71x = 2,578,922.47
  5. Step 5: Solve for x
    x = 2,578,922.47/1,531.71
  6. Step 6: Final answer
    x = 1,683.69

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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.