Home / 5,215.22-7,197.21-2,857.40

Finding the Fourth Proportional to 5,215.22, 7,197.21 and 2,857.40

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Solution

The fourth proportional to 5,215.22, 7,197.21 and 2,857.40 is: 3,943.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,215.22 : 7,197.21 = 2,857.40 : x
  2. Step 2: Convert to fraction form
    5,215.22/7,197.21 = 2,857.40/x
  3. Step 3: Cross multiply
    5,215.22x = 7,197.21 × 2,857.40
  4. Step 4: Simplify right side
    5,215.22x = 20,565,307.85
  5. Step 5: Solve for x
    x = 20,565,307.85/5,215.22
  6. Step 6: Final answer
    x = 3,943.33

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.