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Finding the Fourth Proportional to 6,465.36, 9,679.20 and 3,992.72

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Solution

The fourth proportional to 6,465.36, 9,679.20 and 3,992.72 is: 5,977.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,465.36 : 9,679.20 = 3,992.72 : x
  2. Step 2: Convert to fraction form
    6,465.36/9,679.20 = 3,992.72/x
  3. Step 3: Cross multiply
    6,465.36x = 9,679.20 × 3,992.72
  4. Step 4: Simplify right side
    6,465.36x = 38,646,335.42
  5. Step 5: Solve for x
    x = 38,646,335.42/6,465.36
  6. Step 6: Final answer
    x = 5,977.45

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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.