Home / 21,108.65-31,675.40-7,791.02

Finding the Fourth Proportional to 21,108.65, 31,675.40 and 7,791.02

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Solution

The fourth proportional to 21,108.65, 31,675.40 and 7,791.02 is: 11,691.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,108.65 : 31,675.40 = 7,791.02 : x
  2. Step 2: Convert to fraction form
    21,108.65/31,675.40 = 7,791.02/x
  3. Step 3: Cross multiply
    21,108.65x = 31,675.40 × 7,791.02
  4. Step 4: Simplify right side
    21,108.65x = 246,783,674.91
  5. Step 5: Solve for x
    x = 246,783,674.91/21,108.65
  6. Step 6: Final answer
    x = 11,691.12

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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.