Home / 10,315.89-15,481.26-7,981.74

Finding the Fourth Proportional to 10,315.89, 15,481.26 and 7,981.74

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Solution

The fourth proportional to 10,315.89, 15,481.26 and 7,981.74 is: 11,978.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,315.89 : 15,481.26 = 7,981.74 : x
  2. Step 2: Convert to fraction form
    10,315.89/15,481.26 = 7,981.74/x
  3. Step 3: Cross multiply
    10,315.89x = 15,481.26 × 7,981.74
  4. Step 4: Simplify right side
    10,315.89x = 123,567,392.19
  5. Step 5: Solve for x
    x = 123,567,392.19/10,315.89
  6. Step 6: Final answer
    x = 11,978.35

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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.