Home / 15,379.20-21,221.72-8,663.76

Finding the Fourth Proportional to 15,379.20, 21,221.72 and 8,663.76

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Solution

The fourth proportional to 15,379.20, 21,221.72 and 8,663.76 is: 11,955.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,379.20 : 21,221.72 = 8,663.76 : x
  2. Step 2: Convert to fraction form
    15,379.20/21,221.72 = 8,663.76/x
  3. Step 3: Cross multiply
    15,379.20x = 21,221.72 × 8,663.76
  4. Step 4: Simplify right side
    15,379.20x = 183,859,888.87
  5. Step 5: Solve for x
    x = 183,859,888.87/15,379.20
  6. Step 6: Final answer
    x = 11,955.10

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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.