Home / 12,421.28-17,143.80-7,119.66

Finding the Fourth Proportional to 12,421.28, 17,143.80 and 7,119.66

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Solution

The fourth proportional to 12,421.28, 17,143.80 and 7,119.66 is: 9,826.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,421.28 : 17,143.80 = 7,119.66 : x
  2. Step 2: Convert to fraction form
    12,421.28/17,143.80 = 7,119.66/x
  3. Step 3: Cross multiply
    12,421.28x = 17,143.80 × 7,119.66
  4. Step 4: Simplify right side
    12,421.28x = 122,058,027.11
  5. Step 5: Solve for x
    x = 122,058,027.11/12,421.28
  6. Step 6: Final answer
    x = 9,826.53

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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.