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Finding the Fourth Proportional to 21,680.61, 32,486.90 and 12,910.74

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Solution

The fourth proportional to 21,680.61, 32,486.90 and 12,910.74 is: 19,345.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,680.61 : 32,486.90 = 12,910.74 : x
  2. Step 2: Convert to fraction form
    21,680.61/32,486.90 = 12,910.74/x
  3. Step 3: Cross multiply
    21,680.61x = 32,486.90 × 12,910.74
  4. Step 4: Simplify right side
    21,680.61x = 419,429,854.75
  5. Step 5: Solve for x
    x = 419,429,854.75/21,680.61
  6. Step 6: Final answer
    x = 19,345.85

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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.