Home / 12,780.72-17,637.24-7,115.48

Finding the Fourth Proportional to 12,780.72, 17,637.24 and 7,115.48

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Solution

The fourth proportional to 12,780.72, 17,637.24 and 7,115.48 is: 9,819.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,780.72 : 17,637.24 = 7,115.48 : x
  2. Step 2: Convert to fraction form
    12,780.72/17,637.24 = 7,115.48/x
  3. Step 3: Cross multiply
    12,780.72x = 17,637.24 × 7,115.48
  4. Step 4: Simplify right side
    12,780.72x = 125,497,433.11
  5. Step 5: Solve for x
    x = 125,497,433.11/12,780.72
  6. Step 6: Final answer
    x = 9,819.28

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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.