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Finding the Fourth Proportional to 708.54, 977.76 and 393.80

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Solution

The fourth proportional to 708.54, 977.76 and 393.80 is: 543.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    708.54 : 977.76 = 393.80 : x
  2. Step 2: Convert to fraction form
    708.54/977.76 = 393.80/x
  3. Step 3: Cross multiply
    708.54x = 977.76 × 393.80
  4. Step 4: Simplify right side
    708.54x = 385,036.45
  5. Step 5: Solve for x
    x = 385,036.45/708.54
  6. Step 6: Final answer
    x = 543.42

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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.