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Finding the Fourth Proportional to 720.01, 1,079.11 and 308.66

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Solution

The fourth proportional to 720.01, 1,079.11 and 308.66 is: 462.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    720.01 : 1,079.11 = 308.66 : x
  2. Step 2: Convert to fraction form
    720.01/1,079.11 = 308.66/x
  3. Step 3: Cross multiply
    720.01x = 1,079.11 × 308.66
  4. Step 4: Simplify right side
    720.01x = 333,078.09
  5. Step 5: Solve for x
    x = 333,078.09/720.01
  6. Step 6: Final answer
    x = 462.60

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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.