Home / 2,815.72-4,218.11-1,355.90

Finding the Fourth Proportional to 2,815.72, 4,218.11 and 1,355.90

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Solution

The fourth proportional to 2,815.72, 4,218.11 and 1,355.90 is: 2,031.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,815.72 : 4,218.11 = 1,355.90 : x
  2. Step 2: Convert to fraction form
    2,815.72/4,218.11 = 1,355.90/x
  3. Step 3: Cross multiply
    2,815.72x = 4,218.11 × 1,355.90
  4. Step 4: Simplify right side
    2,815.72x = 5,719,307.48
  5. Step 5: Solve for x
    x = 5,719,307.48/2,815.72
  6. Step 6: Final answer
    x = 2,031.21

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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.