Home / 9,107.90-12,570.09-5,129.78

Finding the Fourth Proportional to 9,107.90, 12,570.09 and 5,129.78

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Solution

The fourth proportional to 9,107.90, 12,570.09 and 5,129.78 is: 7,079.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,107.90 : 12,570.09 = 5,129.78 : x
  2. Step 2: Convert to fraction form
    9,107.90/12,570.09 = 5,129.78/x
  3. Step 3: Cross multiply
    9,107.90x = 12,570.09 × 5,129.78
  4. Step 4: Simplify right side
    9,107.90x = 64,481,796.28
  5. Step 5: Solve for x
    x = 64,481,796.28/9,107.90
  6. Step 6: Final answer
    x = 7,079.77

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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.