Home / 20,811.96-31,190.40-10,931.04

Finding the Fourth Proportional to 20,811.96, 31,190.40 and 10,931.04

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Solution

The fourth proportional to 20,811.96, 31,190.40 and 10,931.04 is: 16,382.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,811.96 : 31,190.40 = 10,931.04 : x
  2. Step 2: Convert to fraction form
    20,811.96/31,190.40 = 10,931.04/x
  3. Step 3: Cross multiply
    20,811.96x = 31,190.40 × 10,931.04
  4. Step 4: Simplify right side
    20,811.96x = 340,943,510.02
  5. Step 5: Solve for x
    x = 340,943,510.02/20,811.96
  6. Step 6: Final answer
    x = 16,382.10

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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.