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Finding the Fourth Proportional to 677.74, 935.30 and 397.91

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Solution

The fourth proportional to 677.74, 935.30 and 397.91 is: 549.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    677.74 : 935.30 = 397.91 : x
  2. Step 2: Convert to fraction form
    677.74/935.30 = 397.91/x
  3. Step 3: Cross multiply
    677.74x = 935.30 × 397.91
  4. Step 4: Simplify right side
    677.74x = 372,165.22
  5. Step 5: Solve for x
    x = 372,165.22/677.74
  6. Step 6: Final answer
    x = 549.13

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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.