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Finding the Fourth Proportional to 708, 976.80 and 511.80

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Solution

The fourth proportional to 708, 976.80 and 511.80 is: 706.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    708 : 976.80 = 511.80 : x
  2. Step 2: Convert to fraction form
    708/976.80 = 511.80/x
  3. Step 3: Cross multiply
    708x = 976.80 × 511.80
  4. Step 4: Simplify right side
    708x = 499,926.24
  5. Step 5: Solve for x
    x = 499,926.24/708
  6. Step 6: Final answer
    x = 706.11

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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.