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Finding the Fourth Proportional to 677.58, 935.00 and 397.80

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Solution

The fourth proportional to 677.58, 935.00 and 397.80 is: 548.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    677.58 : 935.00 = 397.80 : x
  2. Step 2: Convert to fraction form
    677.58/935.00 = 397.80/x
  3. Step 3: Cross multiply
    677.58x = 935.00 × 397.80
  4. Step 4: Simplify right side
    677.58x = 371,941.01
  5. Step 5: Solve for x
    x = 371,941.01/677.58
  6. Step 6: Final answer
    x = 548.93

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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.