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Finding the Fourth Proportional to 707.71, 976.08 and 660.55

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Solution

The fourth proportional to 707.71, 976.08 and 660.55 is: 911.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    707.71 : 976.08 = 660.55 : x
  2. Step 2: Convert to fraction form
    707.71/976.08 = 660.55/x
  3. Step 3: Cross multiply
    707.71x = 976.08 × 660.55
  4. Step 4: Simplify right side
    707.71x = 644,749.64
  5. Step 5: Solve for x
    x = 644,749.64/707.71
  6. Step 6: Final answer
    x = 911.04

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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.