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Finding the Fourth Proportional to 28,113.88, 42,172.82 and 8,390.84

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Solution

The fourth proportional to 28,113.88, 42,172.82 and 8,390.84 is: 12,586.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,113.88 : 42,172.82 = 8,390.84 : x
  2. Step 2: Convert to fraction form
    28,113.88/42,172.82 = 8,390.84/x
  3. Step 3: Cross multiply
    28,113.88x = 42,172.82 × 8,390.84
  4. Step 4: Simplify right side
    28,113.88x = 353,865,384.97
  5. Step 5: Solve for x
    x = 353,865,384.97/28,113.88
  6. Step 6: Final answer
    x = 12,586.86

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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.