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Finding the Fourth Proportional to 15,205.68, 20,983.68 and 8,916.88

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Solution

The fourth proportional to 15,205.68, 20,983.68 and 8,916.88 is: 12,305.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,205.68 : 20,983.68 = 8,916.88 : x
  2. Step 2: Convert to fraction form
    15,205.68/20,983.68 = 8,916.88/x
  3. Step 3: Cross multiply
    15,205.68x = 20,983.68 × 8,916.88
  4. Step 4: Simplify right side
    15,205.68x = 187,108,956.52
  5. Step 5: Solve for x
    x = 187,108,956.52/15,205.68
  6. Step 6: Final answer
    x = 12,305.20

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1.5x scale

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.