Home / 5,421.78-8,128.08-2,137.20

Finding the Fourth Proportional to 5,421.78, 8,128.08 and 2,137.20

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Solution

The fourth proportional to 5,421.78, 8,128.08 and 2,137.20 is: 3,203.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,421.78 : 8,128.08 = 2,137.20 : x
  2. Step 2: Convert to fraction form
    5,421.78/8,128.08 = 2,137.20/x
  3. Step 3: Cross multiply
    5,421.78x = 8,128.08 × 2,137.20
  4. Step 4: Simplify right side
    5,421.78x = 17,371,332.58
  5. Step 5: Solve for x
    x = 17,371,332.58/5,421.78
  6. Step 6: Final answer
    x = 3,203.99

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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.