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Finding the Fourth Proportional to 28,080.92, 38,751.53 and 15,505.67

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Solution

The fourth proportional to 28,080.92, 38,751.53 and 15,505.67 is: 21,397.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,080.92 : 38,751.53 = 15,505.67 : x
  2. Step 2: Convert to fraction form
    28,080.92/38,751.53 = 15,505.67/x
  3. Step 3: Cross multiply
    28,080.92x = 38,751.53 × 15,505.67
  4. Step 4: Simplify right side
    28,080.92x = 600,868,436.18
  5. Step 5: Solve for x
    x = 600,868,436.18/28,080.92
  6. Step 6: Final answer
    x = 21,397.75

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.