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Finding the Fourth Proportional to 705.76, 971.92 and 618.28

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Solution

The fourth proportional to 705.76, 971.92 and 618.28 is: 851.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    705.76 : 971.92 = 618.28 : x
  2. Step 2: Convert to fraction form
    705.76/971.92 = 618.28/x
  3. Step 3: Cross multiply
    705.76x = 971.92 × 618.28
  4. Step 4: Simplify right side
    705.76x = 600,918.70
  5. Step 5: Solve for x
    x = 600,918.70/705.76
  6. Step 6: Final answer
    x = 851.45

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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.