Home / 12,821.20-19,215.60-9,354.40

Finding the Fourth Proportional to 12,821.20, 19,215.60 and 9,354.40

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Solution

The fourth proportional to 12,821.20, 19,215.60 and 9,354.40 is: 14,019.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,821.20 : 19,215.60 = 9,354.40 : x
  2. Step 2: Convert to fraction form
    12,821.20/19,215.60 = 9,354.40/x
  3. Step 3: Cross multiply
    12,821.20x = 19,215.60 × 9,354.40
  4. Step 4: Simplify right side
    12,821.20x = 179,750,408.64
  5. Step 5: Solve for x
    x = 179,750,408.64/12,821.20
  6. Step 6: Final answer
    x = 14,019.78

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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.