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Finding the Fourth Proportional to 705.12, 972.42 and 439.22

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Solution

The fourth proportional to 705.12, 972.42 and 439.22 is: 605.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    705.12 : 972.42 = 439.22 : x
  2. Step 2: Convert to fraction form
    705.12/972.42 = 439.22/x
  3. Step 3: Cross multiply
    705.12x = 972.42 × 439.22
  4. Step 4: Simplify right side
    705.12x = 427,106.31
  5. Step 5: Solve for x
    x = 427,106.31/705.12
  6. Step 6: Final answer
    x = 605.72

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.