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Finding the Fourth Proportional to 21,656.80, 32,480.56 and 12,644.91

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Solution

The fourth proportional to 21,656.80, 32,480.56 and 12,644.91 is: 18,964.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,656.80 : 32,480.56 = 12,644.91 : x
  2. Step 2: Convert to fraction form
    21,656.80/32,480.56 = 12,644.91/x
  3. Step 3: Cross multiply
    21,656.80x = 32,480.56 × 12,644.91
  4. Step 4: Simplify right side
    21,656.80x = 410,713,773.76
  5. Step 5: Solve for x
    x = 410,713,773.76/21,656.80
  6. Step 6: Final answer
    x = 18,964.66

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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.