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Finding the Fourth Proportional to 28,478.70, 42,722.10 and 8,758.89

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Solution

The fourth proportional to 28,478.70, 42,722.10 and 8,758.89 is: 13,139.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,478.70 : 42,722.10 = 8,758.89 : x
  2. Step 2: Convert to fraction form
    28,478.70/42,722.10 = 8,758.89/x
  3. Step 3: Cross multiply
    28,478.70x = 42,722.10 × 8,758.89
  4. Step 4: Simplify right side
    28,478.70x = 374,198,174.47
  5. Step 5: Solve for x
    x = 374,198,174.47/28,478.70
  6. Step 6: Final answer
    x = 13,139.58

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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.