Home / 12,421.28-17,139.48-7,043.42

Finding the Fourth Proportional to 12,421.28, 17,139.48 and 7,043.42

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Solution

The fourth proportional to 12,421.28, 17,139.48 and 7,043.42 is: 9,718.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,421.28 : 17,139.48 = 7,043.42 : x
  2. Step 2: Convert to fraction form
    12,421.28/17,139.48 = 7,043.42/x
  3. Step 3: Cross multiply
    12,421.28x = 17,139.48 × 7,043.42
  4. Step 4: Simplify right side
    12,421.28x = 120,720,556.22
  5. Step 5: Solve for x
    x = 120,720,556.22/12,421.28
  6. Step 6: Final answer
    x = 9,718.85

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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.