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Finding the Fourth Proportional to 14,512.79, 21,778.90 and 5,278.79

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Solution

The fourth proportional to 14,512.79, 21,778.90 and 5,278.79 is: 7,921.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    14,512.79 : 21,778.90 = 5,278.79 : x
  2. Step 2: Convert to fraction form
    14,512.79/21,778.90 = 5,278.79/x
  3. Step 3: Cross multiply
    14,512.79x = 21,778.90 × 5,278.79
  4. Step 4: Simplify right side
    14,512.79x = 114,966,280.78
  5. Step 5: Solve for x
    x = 114,966,280.78/14,512.79
  6. Step 6: Final answer
    x = 7,921.72

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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.