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Finding the Fourth Proportional to 707.62, 976.50 and 392.88

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Solution

The fourth proportional to 707.62, 976.50 and 392.88 is: 542.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    707.62 : 976.50 = 392.88 : x
  2. Step 2: Convert to fraction form
    707.62/976.50 = 392.88/x
  3. Step 3: Cross multiply
    707.62x = 976.50 × 392.88
  4. Step 4: Simplify right side
    707.62x = 383,647.32
  5. Step 5: Solve for x
    x = 383,647.32/707.62
  6. Step 6: Final answer
    x = 542.17

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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.