Home / 12,420.20-17,139.80-7,043.64

Finding the Fourth Proportional to 12,420.20, 17,139.80 and 7,043.64

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Solution

The fourth proportional to 12,420.20, 17,139.80 and 7,043.64 is: 9,720.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,420.20 : 17,139.80 = 7,043.64 : x
  2. Step 2: Convert to fraction form
    12,420.20/17,139.80 = 7,043.64/x
  3. Step 3: Cross multiply
    12,420.20x = 17,139.80 × 7,043.64
  4. Step 4: Simplify right side
    12,420.20x = 120,726,545.65
  5. Step 5: Solve for x
    x = 120,726,545.65/12,420.20
  6. Step 6: Final answer
    x = 9,720.18

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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.