Home / 21,083.79-31,641.30-9,990.54

Finding the Fourth Proportional to 21,083.79, 31,641.30 and 9,990.54

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Solution

The fourth proportional to 21,083.79, 31,641.30 and 9,990.54 is: 14,993.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,083.79 : 31,641.30 = 9,990.54 : x
  2. Step 2: Convert to fraction form
    21,083.79/31,641.30 = 9,990.54/x
  3. Step 3: Cross multiply
    21,083.79x = 31,641.30 × 9,990.54
  4. Step 4: Simplify right side
    21,083.79x = 316,113,673.30
  5. Step 5: Solve for x
    x = 316,113,673.30/21,083.79
  6. Step 6: Final answer
    x = 14,993.21

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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.