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Finding the Fourth Proportional to 707.16, 976.08 and 640.36

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Solution

The fourth proportional to 707.16, 976.08 and 640.36 is: 883.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    707.16 : 976.08 = 640.36 : x
  2. Step 2: Convert to fraction form
    707.16/976.08 = 640.36/x
  3. Step 3: Cross multiply
    707.16x = 976.08 × 640.36
  4. Step 4: Simplify right side
    707.16x = 625,042.59
  5. Step 5: Solve for x
    x = 625,042.59/707.16
  6. Step 6: Final answer
    x = 883.88

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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.