Home / 20,966.12-28,931.92-11,405.92

Finding the Fourth Proportional to 20,966.12, 28,931.92 and 11,405.92

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Solution

The fourth proportional to 20,966.12, 28,931.92 and 11,405.92 is: 15,739.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,966.12 : 28,931.92 = 11,405.92 : x
  2. Step 2: Convert to fraction form
    20,966.12/28,931.92 = 11,405.92/x
  3. Step 3: Cross multiply
    20,966.12x = 28,931.92 × 11,405.92
  4. Step 4: Simplify right side
    20,966.12x = 329,995,164.97
  5. Step 5: Solve for x
    x = 329,995,164.97/20,966.12
  6. Step 6: Final answer
    x = 15,739.45

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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.