Home / 20,972.78-31,454.84-9,278.54

Finding the Fourth Proportional to 20,972.78, 31,454.84 and 9,278.54

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Solution

The fourth proportional to 20,972.78, 31,454.84 and 9,278.54 is: 13,915.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,972.78 : 31,454.84 = 9,278.54 : x
  2. Step 2: Convert to fraction form
    20,972.78/31,454.84 = 9,278.54/x
  3. Step 3: Cross multiply
    20,972.78x = 31,454.84 × 9,278.54
  4. Step 4: Simplify right side
    20,972.78x = 291,854,991.13
  5. Step 5: Solve for x
    x = 291,854,991.13/20,972.78
  6. Step 6: Final answer
    x = 13,915.89

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1.5x scale

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.