Home / 21,378.15-31,910.66-18,853.13

Finding the Fourth Proportional to 21,378.15, 31,910.66 and 18,853.13

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Solution

The fourth proportional to 21,378.15, 31,910.66 and 18,853.13 is: 28,141.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,378.15 : 31,910.66 = 18,853.13 : x
  2. Step 2: Convert to fraction form
    21,378.15/31,910.66 = 18,853.13/x
  3. Step 3: Cross multiply
    21,378.15x = 31,910.66 × 18,853.13
  4. Step 4: Simplify right side
    21,378.15x = 601,615,708.95
  5. Step 5: Solve for x
    x = 601,615,708.95/21,378.15
  6. Step 6: Final answer
    x = 28,141.62

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.