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Finding the Fourth Proportional to 720.19, 1,078.68 and 626.44

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Solution

The fourth proportional to 720.19, 1,078.68 and 626.44 is: 938.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    720.19 : 1,078.68 = 626.44 : x
  2. Step 2: Convert to fraction form
    720.19/1,078.68 = 626.44/x
  3. Step 3: Cross multiply
    720.19x = 1,078.68 × 626.44
  4. Step 4: Simplify right side
    720.19x = 675,728.30
  5. Step 5: Solve for x
    x = 675,728.30/720.19
  6. Step 6: Final answer
    x = 938.26

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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.