Home / 20,658.28-31,009.26-12,872.56

Finding the Fourth Proportional to 20,658.28, 31,009.26 and 12,872.56

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Solution

The fourth proportional to 20,658.28, 31,009.26 and 12,872.56 is: 19,322.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,658.28 : 31,009.26 = 12,872.56 : x
  2. Step 2: Convert to fraction form
    20,658.28/31,009.26 = 12,872.56/x
  3. Step 3: Cross multiply
    20,658.28x = 31,009.26 × 12,872.56
  4. Step 4: Simplify right side
    20,658.28x = 399,168,559.91
  5. Step 5: Solve for x
    x = 399,168,559.91/20,658.28
  6. Step 6: Final answer
    x = 19,322.45

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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.