Home / 21,187.93-31,792.21-8,711.70

Finding the Fourth Proportional to 21,187.93, 31,792.21 and 8,711.70

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Solution

The fourth proportional to 21,187.93, 31,792.21 and 8,711.70 is: 13,071.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,187.93 : 31,792.21 = 8,711.70 : x
  2. Step 2: Convert to fraction form
    21,187.93/31,792.21 = 8,711.70/x
  3. Step 3: Cross multiply
    21,187.93x = 31,792.21 × 8,711.70
  4. Step 4: Simplify right side
    21,187.93x = 276,964,036.90
  5. Step 5: Solve for x
    x = 276,964,036.90/21,187.93
  6. Step 6: Final answer
    x = 13,071.79

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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.