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Finding the Fourth Proportional to 709.80, 1,064.86 and 325.16

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Solution

The fourth proportional to 709.80, 1,064.86 and 325.16 is: 487.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    709.80 : 1,064.86 = 325.16 : x
  2. Step 2: Convert to fraction form
    709.80/1,064.86 = 325.16/x
  3. Step 3: Cross multiply
    709.80x = 1,064.86 × 325.16
  4. Step 4: Simplify right side
    709.80x = 346,249.88
  5. Step 5: Solve for x
    x = 346,249.88/709.80
  6. Step 6: Final answer
    x = 487.81

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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.