Home / 15,394.50-21,245.70-8,679.78

Finding the Fourth Proportional to 15,394.50, 21,245.70 and 8,679.78

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Solution

The fourth proportional to 15,394.50, 21,245.70 and 8,679.78 is: 11,978.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,394.50 : 21,245.70 = 8,679.78 : x
  2. Step 2: Convert to fraction form
    15,394.50/21,245.70 = 8,679.78/x
  3. Step 3: Cross multiply
    15,394.50x = 21,245.70 × 8,679.78
  4. Step 4: Simplify right side
    15,394.50x = 184,408,001.95
  5. Step 5: Solve for x
    x = 184,408,001.95/15,394.50
  6. Step 6: Final answer
    x = 11,978.82

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.