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Finding the Fourth Proportional to 28,540.70, 42,811.05 and 25,478.90

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Solution

The fourth proportional to 28,540.70, 42,811.05 and 25,478.90 is: 38,218.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,540.70 : 42,811.05 = 25,478.90 : x
  2. Step 2: Convert to fraction form
    28,540.70/42,811.05 = 25,478.90/x
  3. Step 3: Cross multiply
    28,540.70x = 42,811.05 × 25,478.90
  4. Step 4: Simplify right side
    28,540.70x = 1,090,778,461.85
  5. Step 5: Solve for x
    x = 1,090,778,461.85/28,540.70
  6. Step 6: Final answer
    x = 38,218.35

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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.