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Finding the Fourth Proportional to 18,981.63, 28,472.54 and 12,449.18

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Solution

The fourth proportional to 18,981.63, 28,472.54 and 12,449.18 is: 18,673.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,981.63 : 28,472.54 = 12,449.18 : x
  2. Step 2: Convert to fraction form
    18,981.63/28,472.54 = 12,449.18/x
  3. Step 3: Cross multiply
    18,981.63x = 28,472.54 × 12,449.18
  4. Step 4: Simplify right side
    18,981.63x = 354,459,570.91
  5. Step 5: Solve for x
    x = 354,459,570.91/18,981.63
  6. Step 6: Final answer
    x = 18,673.82

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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.