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Finding the Fourth Proportional to 708.59, 977.90 and 393.90

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Solution

The fourth proportional to 708.59, 977.90 and 393.90 is: 543.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    708.59 : 977.90 = 393.90 : x
  2. Step 2: Convert to fraction form
    708.59/977.90 = 393.90/x
  3. Step 3: Cross multiply
    708.59x = 977.90 × 393.90
  4. Step 4: Simplify right side
    708.59x = 385,192.84
  5. Step 5: Solve for x
    x = 385,192.84/708.59
  6. Step 6: Final answer
    x = 543.61

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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.