Home / 15,719.31-21,693.03-8,645.91

Finding the Fourth Proportional to 15,719.31, 21,693.03 and 8,645.91

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Solution

The fourth proportional to 15,719.31, 21,693.03 and 8,645.91 is: 11,931.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,719.31 : 21,693.03 = 8,645.91 : x
  2. Step 2: Convert to fraction form
    15,719.31/21,693.03 = 8,645.91/x
  3. Step 3: Cross multiply
    15,719.31x = 21,693.03 × 8,645.91
  4. Step 4: Simplify right side
    15,719.31x = 187,555,985.01
  5. Step 5: Solve for x
    x = 187,555,985.01/15,719.31
  6. Step 6: Final answer
    x = 11,931.57

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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.