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Finding the Fourth Proportional to 18,756.70, 28,138.20 and 5,610.40

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Solution

The fourth proportional to 18,756.70, 28,138.20 and 5,610.40 is: 8,416.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,756.70 : 28,138.20 = 5,610.40 : x
  2. Step 2: Convert to fraction form
    18,756.70/28,138.20 = 5,610.40/x
  3. Step 3: Cross multiply
    18,756.70x = 28,138.20 × 5,610.40
  4. Step 4: Simplify right side
    18,756.70x = 157,866,557.28
  5. Step 5: Solve for x
    x = 157,866,557.28/18,756.70
  6. Step 6: Final answer
    x = 8,416.54

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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.