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Finding the Fourth Proportional to 18,765.70, 28,140.24 and 5,615.56

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Solution

The fourth proportional to 18,765.70, 28,140.24 and 5,615.56 is: 8,420.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,765.70 : 28,140.24 = 5,615.56 : x
  2. Step 2: Convert to fraction form
    18,765.70/28,140.24 = 5,615.56/x
  3. Step 3: Cross multiply
    18,765.70x = 28,140.24 × 5,615.56
  4. Step 4: Simplify right side
    18,765.70x = 158,023,206.13
  5. Step 5: Solve for x
    x = 158,023,206.13/18,765.70
  6. Step 6: Final answer
    x = 8,420.85

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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.