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Finding the Fourth Proportional to 15,138.30, 20,890.52 and 8,765.16

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Solution

The fourth proportional to 15,138.30, 20,890.52 and 8,765.16 is: 12,095.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,138.30 : 20,890.52 = 8,765.16 : x
  2. Step 2: Convert to fraction form
    15,138.30/20,890.52 = 8,765.16/x
  3. Step 3: Cross multiply
    15,138.30x = 20,890.52 × 8,765.16
  4. Step 4: Simplify right side
    15,138.30x = 183,108,750.28
  5. Step 5: Solve for x
    x = 183,108,750.28/15,138.30
  6. Step 6: Final answer
    x = 12,095.73

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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.