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Finding the Fourth Proportional to 705.18, 971.72 and 668.12

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Solution

The fourth proportional to 705.18, 971.72 and 668.12 is: 920.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    705.18 : 971.72 = 668.12 : x
  2. Step 2: Convert to fraction form
    705.18/971.72 = 668.12/x
  3. Step 3: Cross multiply
    705.18x = 971.72 × 668.12
  4. Step 4: Simplify right side
    705.18x = 649,225.57
  5. Step 5: Solve for x
    x = 649,225.57/705.18
  6. Step 6: Final answer
    x = 920.65

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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.