Home / 5,421.78-8,129.58-2,133.08

Finding the Fourth Proportional to 5,421.78, 8,129.58 and 2,133.08

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Solution

The fourth proportional to 5,421.78, 8,129.58 and 2,133.08 is: 3,198.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,421.78 : 8,129.58 = 2,133.08 : x
  2. Step 2: Convert to fraction form
    5,421.78/8,129.58 = 2,133.08/x
  3. Step 3: Cross multiply
    5,421.78x = 8,129.58 × 2,133.08
  4. Step 4: Simplify right side
    5,421.78x = 17,341,026.35
  5. Step 5: Solve for x
    x = 17,341,026.35/5,421.78
  6. Step 6: Final answer
    x = 3,198.40

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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.