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Finding the Fourth Proportional to 710.80, 1,065.35 and 418.44

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Solution

The fourth proportional to 710.80, 1,065.35 and 418.44 is: 627.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    710.80 : 1,065.35 = 418.44 : x
  2. Step 2: Convert to fraction form
    710.80/1,065.35 = 418.44/x
  3. Step 3: Cross multiply
    710.80x = 1,065.35 × 418.44
  4. Step 4: Simplify right side
    710.80x = 445,785.05
  5. Step 5: Solve for x
    x = 445,785.05/710.80
  6. Step 6: Final answer
    x = 627.16

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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.