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Finding the Fourth Proportional to 720.67, 1,081.02 and 309.40

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Solution

The fourth proportional to 720.67, 1,081.02 and 309.40 is: 464.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    720.67 : 1,081.02 = 309.40 : x
  2. Step 2: Convert to fraction form
    720.67/1,081.02 = 309.40/x
  3. Step 3: Cross multiply
    720.67x = 1,081.02 × 309.40
  4. Step 4: Simplify right side
    720.67x = 334,467.59
  5. Step 5: Solve for x
    x = 334,467.59/720.67
  6. Step 6: Final answer
    x = 464.11

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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.