Home / 1,440.40-1,988.28-961.96

Finding the Fourth Proportional to 1,440.40, 1,988.28 and 961.96

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Solution

The fourth proportional to 1,440.40, 1,988.28 and 961.96 is: 1,327.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,440.40 : 1,988.28 = 961.96 : x
  2. Step 2: Convert to fraction form
    1,440.40/1,988.28 = 961.96/x
  3. Step 3: Cross multiply
    1,440.40x = 1,988.28 × 961.96
  4. Step 4: Simplify right side
    1,440.40x = 1,912,645.83
  5. Step 5: Solve for x
    x = 1,912,645.83/1,440.40
  6. Step 6: Final answer
    x = 1,327.86

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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.