Home / 18,918.18-28,381.80-5,769.72

Finding the Fourth Proportional to 18,918.18, 28,381.80 and 5,769.72

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Solution

The fourth proportional to 18,918.18, 28,381.80 and 5,769.72 is: 8,655.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,918.18 : 28,381.80 = 5,769.72 : x
  2. Step 2: Convert to fraction form
    18,918.18/28,381.80 = 5,769.72/x
  3. Step 3: Cross multiply
    18,918.18x = 28,381.80 × 5,769.72
  4. Step 4: Simplify right side
    18,918.18x = 163,755,039.10
  5. Step 5: Solve for x
    x = 163,755,039.10/18,918.18
  6. Step 6: Final answer
    x = 8,655.96

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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.