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Finding the Fourth Proportional to 707.72, 976.66 and 392.99

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Solution

The fourth proportional to 707.72, 976.66 and 392.99 is: 542.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    707.72 : 976.66 = 392.99 : x
  2. Step 2: Convert to fraction form
    707.72/976.66 = 392.99/x
  3. Step 3: Cross multiply
    707.72x = 976.66 × 392.99
  4. Step 4: Simplify right side
    707.72x = 383,811.75
  5. Step 5: Solve for x
    x = 383,811.75/707.72
  6. Step 6: Final answer
    x = 542.33

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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.