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Finding the Fourth Proportional to 10,494.15, 15,739.40 and 3,920.39

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Solution

The fourth proportional to 10,494.15, 15,739.40 and 3,920.39 is: 5,879.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,494.15 : 15,739.40 = 3,920.39 : x
  2. Step 2: Convert to fraction form
    10,494.15/15,739.40 = 3,920.39/x
  3. Step 3: Cross multiply
    10,494.15x = 15,739.40 × 3,920.39
  4. Step 4: Simplify right side
    10,494.15x = 61,704,566.76
  5. Step 5: Solve for x
    x = 61,704,566.76/10,494.15
  6. Step 6: Final answer
    x = 5,879.90

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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.