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Finding the Fourth Proportional to 730.20, 1,094.39 and 642.72

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Solution

The fourth proportional to 730.20, 1,094.39 and 642.72 is: 963.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    730.20 : 1,094.39 = 642.72 : x
  2. Step 2: Convert to fraction form
    730.20/1,094.39 = 642.72/x
  3. Step 3: Cross multiply
    730.20x = 1,094.39 × 642.72
  4. Step 4: Simplify right side
    730.20x = 703,386.34
  5. Step 5: Solve for x
    x = 703,386.34/730.20
  6. Step 6: Final answer
    x = 963.28

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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.