Home / 20,868.42-31,280.76-9,765.75

Finding the Fourth Proportional to 20,868.42, 31,280.76 and 9,765.75

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Solution

The fourth proportional to 20,868.42, 31,280.76 and 9,765.75 is: 14,638.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,868.42 : 31,280.76 = 9,765.75 : x
  2. Step 2: Convert to fraction form
    20,868.42/31,280.76 = 9,765.75/x
  3. Step 3: Cross multiply
    20,868.42x = 31,280.76 × 9,765.75
  4. Step 4: Simplify right side
    20,868.42x = 305,480,081.97
  5. Step 5: Solve for x
    x = 305,480,081.97/20,868.42
  6. Step 6: Final answer
    x = 14,638.39

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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.