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Finding the Fourth Proportional to 708.42, 977.52 and 393.64

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Solution

The fourth proportional to 708.42, 977.52 and 393.64 is: 543.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    708.42 : 977.52 = 393.64 : x
  2. Step 2: Convert to fraction form
    708.42/977.52 = 393.64/x
  3. Step 3: Cross multiply
    708.42x = 977.52 × 393.64
  4. Step 4: Simplify right side
    708.42x = 384,790.97
  5. Step 5: Solve for x
    x = 384,790.97/708.42
  6. Step 6: Final answer
    x = 543.17

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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.