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Finding the Fourth Proportional to 28,379.60, 42,593.70 and 12,608.90

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Solution

The fourth proportional to 28,379.60, 42,593.70 and 12,608.90 is: 18,924.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,379.60 : 42,593.70 = 12,608.90 : x
  2. Step 2: Convert to fraction form
    28,379.60/42,593.70 = 12,608.90/x
  3. Step 3: Cross multiply
    28,379.60x = 42,593.70 × 12,608.90
  4. Step 4: Simplify right side
    28,379.60x = 537,059,703.93
  5. Step 5: Solve for x
    x = 537,059,703.93/28,379.60
  6. Step 6: Final answer
    x = 18,924.15

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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.