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Finding the Fourth Proportional to 18,765.30, 28,159.50 and 7,672.05

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Solution

The fourth proportional to 18,765.30, 28,159.50 and 7,672.05 is: 11,512.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,765.30 : 28,159.50 = 7,672.05 : x
  2. Step 2: Convert to fraction form
    18,765.30/28,159.50 = 7,672.05/x
  3. Step 3: Cross multiply
    18,765.30x = 28,159.50 × 7,672.05
  4. Step 4: Simplify right side
    18,765.30x = 216,041,077.59
  5. Step 5: Solve for x
    x = 216,041,077.59/18,765.30
  6. Step 6: Final answer
    x = 11,512.79

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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.