Home / 21,036.28-31,545.18-7,879.42

Finding the Fourth Proportional to 21,036.28, 31,545.18 and 7,879.42

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Solution

The fourth proportional to 21,036.28, 31,545.18 and 7,879.42 is: 11,815.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,036.28 : 31,545.18 = 7,879.42 : x
  2. Step 2: Convert to fraction form
    21,036.28/31,545.18 = 7,879.42/x
  3. Step 3: Cross multiply
    21,036.28x = 31,545.18 × 7,879.42
  4. Step 4: Simplify right side
    21,036.28x = 248,557,564.47
  5. Step 5: Solve for x
    x = 248,557,564.47/21,036.28
  6. Step 6: Final answer
    x = 11,815.66

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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.