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Finding the Fourth Proportional to 6,459.68, 9,689.84 and 3,879.20

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Solution

The fourth proportional to 6,459.68, 9,689.84 and 3,879.20 is: 5,818.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,459.68 : 9,689.84 = 3,879.20 : x
  2. Step 2: Convert to fraction form
    6,459.68/9,689.84 = 3,879.20/x
  3. Step 3: Cross multiply
    6,459.68x = 9,689.84 × 3,879.20
  4. Step 4: Simplify right side
    6,459.68x = 37,588,827.33
  5. Step 5: Solve for x
    x = 37,588,827.33/6,459.68
  6. Step 6: Final answer
    x = 5,818.99

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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.