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Finding the Fourth Proportional to 21,640.75, 32,375.71 and 16,390.89

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Solution

The fourth proportional to 21,640.75, 32,375.71 and 16,390.89 is: 24,521.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,640.75 : 32,375.71 = 16,390.89 : x
  2. Step 2: Convert to fraction form
    21,640.75/32,375.71 = 16,390.89/x
  3. Step 3: Cross multiply
    21,640.75x = 32,375.71 × 16,390.89
  4. Step 4: Simplify right side
    21,640.75x = 530,666,721.77
  5. Step 5: Solve for x
    x = 530,666,721.77/21,640.75
  6. Step 6: Final answer
    x = 24,521.64

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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.