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Finding the Fourth Proportional to 28,611.70, 42,917.55 and 28,125.70

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Solution

The fourth proportional to 28,611.70, 42,917.55 and 28,125.70 is: 42,188.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,611.70 : 42,917.55 = 28,125.70 : x
  2. Step 2: Convert to fraction form
    28,611.70/42,917.55 = 28,125.70/x
  3. Step 3: Cross multiply
    28,611.70x = 42,917.55 × 28,125.70
  4. Step 4: Simplify right side
    28,611.70x = 1,207,086,136.04
  5. Step 5: Solve for x
    x = 1,207,086,136.04/28,611.70
  6. Step 6: Final answer
    x = 42,188.55

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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.