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Finding the Fourth Proportional to 21,264.78, 31,903.42 and 8,785.52

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Solution

The fourth proportional to 21,264.78, 31,903.42 and 8,785.52 is: 13,180.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,264.78 : 31,903.42 = 8,785.52 : x
  2. Step 2: Convert to fraction form
    21,264.78/31,903.42 = 8,785.52/x
  3. Step 3: Cross multiply
    21,264.78x = 31,903.42 × 8,785.52
  4. Step 4: Simplify right side
    21,264.78x = 280,288,134.48
  5. Step 5: Solve for x
    x = 280,288,134.48/21,264.78
  6. Step 6: Final answer
    x = 13,180.86

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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.