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Finding the Fourth Proportional to 3,421.86, 5,125.86 and 2,688

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Solution

The fourth proportional to 3,421.86, 5,125.86 and 2,688 is: 4,026.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,421.86 : 5,125.86 = 2,688 : x
  2. Step 2: Convert to fraction form
    3,421.86/5,125.86 = 2,688/x
  3. Step 3: Cross multiply
    3,421.86x = 5,125.86 × 2,688
  4. Step 4: Simplify right side
    3,421.86x = 13,778,311.68
  5. Step 5: Solve for x
    x = 13,778,311.68/3,421.86
  6. Step 6: Final answer
    x = 4,026.56

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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.