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Finding the Fourth Proportional to 5,416.90, 8,125.35 and 2,128.90

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Solution

The fourth proportional to 5,416.90, 8,125.35 and 2,128.90 is: 3,193.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,416.90 : 8,125.35 = 2,128.90 : x
  2. Step 2: Convert to fraction form
    5,416.90/8,125.35 = 2,128.90/x
  3. Step 3: Cross multiply
    5,416.90x = 8,125.35 × 2,128.90
  4. Step 4: Simplify right side
    5,416.90x = 17,298,057.62
  5. Step 5: Solve for x
    x = 17,298,057.62/5,416.90
  6. Step 6: Final answer
    x = 3,193.35

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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.