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Finding the Fourth Proportional to 28,540.70, 42,811.05 and 7,480.70

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Solution

The fourth proportional to 28,540.70, 42,811.05 and 7,480.70 is: 11,221.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,540.70 : 42,811.05 = 7,480.70 : x
  2. Step 2: Convert to fraction form
    28,540.70/42,811.05 = 7,480.70/x
  3. Step 3: Cross multiply
    28,540.70x = 42,811.05 × 7,480.70
  4. Step 4: Simplify right side
    28,540.70x = 320,256,621.74
  5. Step 5: Solve for x
    x = 320,256,621.74/28,540.70
  6. Step 6: Final answer
    x = 11,221.05

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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.