Home / 21,036.92-31,578.12-18,711.81

Finding the Fourth Proportional to 21,036.92, 31,578.12 and 18,711.81

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Solution

The fourth proportional to 21,036.92, 31,578.12 and 18,711.81 is: 28,087.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,036.92 : 31,578.12 = 18,711.81 : x
  2. Step 2: Convert to fraction form
    21,036.92/31,578.12 = 18,711.81/x
  3. Step 3: Cross multiply
    21,036.92x = 31,578.12 × 18,711.81
  4. Step 4: Simplify right side
    21,036.92x = 590,883,781.60
  5. Step 5: Solve for x
    x = 590,883,781.60/21,036.92
  6. Step 6: Final answer
    x = 28,087.95

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1.5x scale

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.