Home / 3,109.15-4,663.88-918.05

Finding the Fourth Proportional to 3,109.15, 4,663.88 and 918.05

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Solution

The fourth proportional to 3,109.15, 4,663.88 and 918.05 is: 1,377.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,109.15 : 4,663.88 = 918.05 : x
  2. Step 2: Convert to fraction form
    3,109.15/4,663.88 = 918.05/x
  3. Step 3: Cross multiply
    3,109.15x = 4,663.88 × 918.05
  4. Step 4: Simplify right side
    3,109.15x = 4,281,676.80
  5. Step 5: Solve for x
    x = 4,281,676.80/3,109.15
  6. Step 6: Final answer
    x = 1,377.12

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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.