Home / 21,818.32-30,112.10-13,318.66

Finding the Fourth Proportional to 21,818.32, 30,112.10 and 13,318.66

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Solution

The fourth proportional to 21,818.32, 30,112.10 and 13,318.66 is: 18,381.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,818.32 : 30,112.10 = 13,318.66 : x
  2. Step 2: Convert to fraction form
    21,818.32/30,112.10 = 13,318.66/x
  3. Step 3: Cross multiply
    21,818.32x = 30,112.10 × 13,318.66
  4. Step 4: Simplify right side
    21,818.32x = 401,052,821.79
  5. Step 5: Solve for x
    x = 401,052,821.79/21,818.32
  6. Step 6: Final answer
    x = 18,381.47

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.