Home / 20,671.28-31,028.76-12,885.44

Finding the Fourth Proportional to 20,671.28, 31,028.76 and 12,885.44

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Solution

The fourth proportional to 20,671.28, 31,028.76 and 12,885.44 is: 19,341.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,671.28 : 31,028.76 = 12,885.44 : x
  2. Step 2: Convert to fraction form
    20,671.28/31,028.76 = 12,885.44/x
  3. Step 3: Cross multiply
    20,671.28x = 31,028.76 × 12,885.44
  4. Step 4: Simplify right side
    20,671.28x = 399,819,225.25
  5. Step 5: Solve for x
    x = 399,819,225.25/20,671.28
  6. Step 6: Final answer
    x = 19,341.77

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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.