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Finding the Fourth Proportional to 707.92, 976.43 and 487.40

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Solution

The fourth proportional to 707.92, 976.43 and 487.40 is: 672.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    707.92 : 976.43 = 487.40 : x
  2. Step 2: Convert to fraction form
    707.92/976.43 = 487.40/x
  3. Step 3: Cross multiply
    707.92x = 976.43 × 487.40
  4. Step 4: Simplify right side
    707.92x = 475,907.10
  5. Step 5: Solve for x
    x = 475,907.10/707.92
  6. Step 6: Final answer
    x = 672.27

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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.