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Finding the Fourth Proportional to 677.76, 935.15 and 397.93

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Solution

The fourth proportional to 677.76, 935.15 and 397.93 is: 549.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    677.76 : 935.15 = 397.93 : x
  2. Step 2: Convert to fraction form
    677.76/935.15 = 397.93/x
  3. Step 3: Cross multiply
    677.76x = 935.15 × 397.93
  4. Step 4: Simplify right side
    677.76x = 372,124.24
  5. Step 5: Solve for x
    x = 372,124.24/677.76
  6. Step 6: Final answer
    x = 549.05

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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.