Home / 18,918.12-28,363.32-6,434.78

Finding the Fourth Proportional to 18,918.12, 28,363.32 and 6,434.78

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Solution

The fourth proportional to 18,918.12, 28,363.32 and 6,434.78 is: 9,647.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,918.12 : 28,363.32 = 6,434.78 : x
  2. Step 2: Convert to fraction form
    18,918.12/28,363.32 = 6,434.78/x
  3. Step 3: Cross multiply
    18,918.12x = 28,363.32 × 6,434.78
  4. Step 4: Simplify right side
    18,918.12x = 182,511,839.87
  5. Step 5: Solve for x
    x = 182,511,839.87/18,918.12
  6. Step 6: Final answer
    x = 9,647.46

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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.