Home / 21,877.81-30,190.67-12,318.19

Finding the Fourth Proportional to 21,877.81, 30,190.67 and 12,318.19

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Solution

The fourth proportional to 21,877.81, 30,190.67 and 12,318.19 is: 16,998.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,877.81 : 30,190.67 = 12,318.19 : x
  2. Step 2: Convert to fraction form
    21,877.81/30,190.67 = 12,318.19/x
  3. Step 3: Cross multiply
    21,877.81x = 30,190.67 × 12,318.19
  4. Step 4: Simplify right side
    21,877.81x = 371,894,258.33
  5. Step 5: Solve for x
    x = 371,894,258.33/21,877.81
  6. Step 6: Final answer
    x = 16,998.70

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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.