Home / 20,745.40-31,118.10-12,854.20

Finding the Fourth Proportional to 20,745.40, 31,118.10 and 12,854.20

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Solution

The fourth proportional to 20,745.40, 31,118.10 and 12,854.20 is: 19,281.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,745.40 : 31,118.10 = 12,854.20 : x
  2. Step 2: Convert to fraction form
    20,745.40/31,118.10 = 12,854.20/x
  3. Step 3: Cross multiply
    20,745.40x = 31,118.10 × 12,854.20
  4. Step 4: Simplify right side
    20,745.40x = 399,998,281.02
  5. Step 5: Solve for x
    x = 399,998,281.02/20,745.40
  6. Step 6: Final answer
    x = 19,281.30

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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.