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Finding the Fourth Proportional to 14,956.80, 20,641.92 and 8,990.40

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Solution

The fourth proportional to 14,956.80, 20,641.92 and 8,990.40 is: 12,407.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    14,956.80 : 20,641.92 = 8,990.40 : x
  2. Step 2: Convert to fraction form
    14,956.80/20,641.92 = 8,990.40/x
  3. Step 3: Cross multiply
    14,956.80x = 20,641.92 × 8,990.40
  4. Step 4: Simplify right side
    14,956.80x = 185,579,117.57
  5. Step 5: Solve for x
    x = 185,579,117.57/14,956.80
  6. Step 6: Final answer
    x = 12,407.68

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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.