Home / 5,415.78-8,117.12-2,638.30

Finding the Fourth Proportional to 5,415.78, 8,117.12 and 2,638.30

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Solution

The fourth proportional to 5,415.78, 8,117.12 and 2,638.30 is: 3,954.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,415.78 : 8,117.12 = 2,638.30 : x
  2. Step 2: Convert to fraction form
    5,415.78/8,117.12 = 2,638.30/x
  3. Step 3: Cross multiply
    5,415.78x = 8,117.12 × 2,638.30
  4. Step 4: Simplify right side
    5,415.78x = 21,415,397.70
  5. Step 5: Solve for x
    x = 21,415,397.70/5,415.78
  6. Step 6: Final answer
    x = 3,954.26

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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.