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Finding the Fourth Proportional to 8,689.74, 12,922.82 and 8,412.95

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Solution

The fourth proportional to 8,689.74, 12,922.82 and 8,412.95 is: 12,511.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,689.74 : 12,922.82 = 8,412.95 : x
  2. Step 2: Convert to fraction form
    8,689.74/12,922.82 = 8,412.95/x
  3. Step 3: Cross multiply
    8,689.74x = 12,922.82 × 8,412.95
  4. Step 4: Simplify right side
    8,689.74x = 108,718,931.84
  5. Step 5: Solve for x
    x = 108,718,931.84/8,689.74
  6. Step 6: Final answer
    x = 12,511.18

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.