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Finding the Fourth Proportional to 707.66, 976.80 and 487.34

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Solution

The fourth proportional to 707.66, 976.80 and 487.34 is: 672.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    707.66 : 976.80 = 487.34 : x
  2. Step 2: Convert to fraction form
    707.66/976.80 = 487.34/x
  3. Step 3: Cross multiply
    707.66x = 976.80 × 487.34
  4. Step 4: Simplify right side
    707.66x = 476,033.71
  5. Step 5: Solve for x
    x = 476,033.71/707.66
  6. Step 6: Final answer
    x = 672.69

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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.