Home / 20,921.68-31,304.08-12,457.22

Finding the Fourth Proportional to 20,921.68, 31,304.08 and 12,457.22

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Solution

The fourth proportional to 20,921.68, 31,304.08 and 12,457.22 is: 18,639.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,921.68 : 31,304.08 = 12,457.22 : x
  2. Step 2: Convert to fraction form
    20,921.68/31,304.08 = 12,457.22/x
  3. Step 3: Cross multiply
    20,921.68x = 31,304.08 × 12,457.22
  4. Step 4: Simplify right side
    20,921.68x = 389,961,811.46
  5. Step 5: Solve for x
    x = 389,961,811.46/20,921.68
  6. Step 6: Final answer
    x = 18,639.13

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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.