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Finding the Fourth Proportional to 15,107.78, 20,859.16 and 9,445.08

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Solution

The fourth proportional to 15,107.78, 20,859.16 and 9,445.08 is: 13,040.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,107.78 : 20,859.16 = 9,445.08 : x
  2. Step 2: Convert to fraction form
    15,107.78/20,859.16 = 9,445.08/x
  3. Step 3: Cross multiply
    15,107.78x = 20,859.16 × 9,445.08
  4. Step 4: Simplify right side
    15,107.78x = 197,016,434.93
  5. Step 5: Solve for x
    x = 197,016,434.93/15,107.78
  6. Step 6: Final answer
    x = 13,040.73

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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.