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Finding the Fourth Proportional to 708.48, 977.76 and 393.78

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Solution

The fourth proportional to 708.48, 977.76 and 393.78 is: 543.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    708.48 : 977.76 = 393.78 : x
  2. Step 2: Convert to fraction form
    708.48/977.76 = 393.78/x
  3. Step 3: Cross multiply
    708.48x = 977.76 × 393.78
  4. Step 4: Simplify right side
    708.48x = 385,022.33
  5. Step 5: Solve for x
    x = 385,022.33/708.48
  6. Step 6: Final answer
    x = 543.45

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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.