Home / 12,420.28-17,142.42-7,118.65

Finding the Fourth Proportional to 12,420.28, 17,142.42 and 7,118.65

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Solution

The fourth proportional to 12,420.28, 17,142.42 and 7,118.65 is: 9,825.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,420.28 : 17,142.42 = 7,118.65 : x
  2. Step 2: Convert to fraction form
    12,420.28/17,142.42 = 7,118.65/x
  3. Step 3: Cross multiply
    12,420.28x = 17,142.42 × 7,118.65
  4. Step 4: Simplify right side
    12,420.28x = 122,030,888.13
  5. Step 5: Solve for x
    x = 122,030,888.13/12,420.28
  6. Step 6: Final answer
    x = 9,825.13

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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.