Home / 5,415.78-8,117.13-2,638.29

Finding the Fourth Proportional to 5,415.78, 8,117.13 and 2,638.29

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Solution

The fourth proportional to 5,415.78, 8,117.13 and 2,638.29 is: 3,954.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,415.78 : 8,117.13 = 2,638.29 : x
  2. Step 2: Convert to fraction form
    5,415.78/8,117.13 = 2,638.29/x
  3. Step 3: Cross multiply
    5,415.78x = 8,117.13 × 2,638.29
  4. Step 4: Simplify right side
    5,415.78x = 21,415,342.91
  5. Step 5: Solve for x
    x = 21,415,342.91/5,415.78
  6. Step 6: Final answer
    x = 3,954.25

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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.