Home / 21,159.12-31,740.26-7,119.09

Finding the Fourth Proportional to 21,159.12, 31,740.26 and 7,119.09

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Solution

The fourth proportional to 21,159.12, 31,740.26 and 7,119.09 is: 10,679.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,159.12 : 31,740.26 = 7,119.09 : x
  2. Step 2: Convert to fraction form
    21,159.12/31,740.26 = 7,119.09/x
  3. Step 3: Cross multiply
    21,159.12x = 31,740.26 × 7,119.09
  4. Step 4: Simplify right side
    21,159.12x = 225,961,731.97
  5. Step 5: Solve for x
    x = 225,961,731.97/21,159.12
  6. Step 6: Final answer
    x = 10,679.16

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.