Home / 1,291.30-1,937.63-1,221.60

Finding the Fourth Proportional to 1,291.30, 1,937.63 and 1,221.60

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Solution

The fourth proportional to 1,291.30, 1,937.63 and 1,221.60 is: 1,833.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,291.30 : 1,937.63 = 1,221.60 : x
  2. Step 2: Convert to fraction form
    1,291.30/1,937.63 = 1,221.60/x
  3. Step 3: Cross multiply
    1,291.30x = 1,937.63 × 1,221.60
  4. Step 4: Simplify right side
    1,291.30x = 2,367,008.81
  5. Step 5: Solve for x
    x = 2,367,008.81/1,291.30
  6. Step 6: Final answer
    x = 1,833.04

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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.