Home / 20,655.28-31,004.76-12,869.56

Finding the Fourth Proportional to 20,655.28, 31,004.76 and 12,869.56

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Solution

The fourth proportional to 20,655.28, 31,004.76 and 12,869.56 is: 19,317.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,655.28 : 31,004.76 = 12,869.56 : x
  2. Step 2: Convert to fraction form
    20,655.28/31,004.76 = 12,869.56/x
  3. Step 3: Cross multiply
    20,655.28x = 31,004.76 × 12,869.56
  4. Step 4: Simplify right side
    20,655.28x = 399,017,619.11
  5. Step 5: Solve for x
    x = 399,017,619.11/20,655.28
  6. Step 6: Final answer
    x = 19,317.95

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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.