Home / 21,261.07-31,898.90-8,115.38

Finding the Fourth Proportional to 21,261.07, 31,898.90 and 8,115.38

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Solution

The fourth proportional to 21,261.07, 31,898.90 and 8,115.38 is: 12,175.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,261.07 : 31,898.90 = 8,115.38 : x
  2. Step 2: Convert to fraction form
    21,261.07/31,898.90 = 8,115.38/x
  3. Step 3: Cross multiply
    21,261.07x = 31,898.90 × 8,115.38
  4. Step 4: Simplify right side
    21,261.07x = 258,871,695.08
  5. Step 5: Solve for x
    x = 258,871,695.08/21,261.07
  6. Step 6: Final answer
    x = 12,175.85

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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.