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Finding the Fourth Proportional to 678.15, 935.87 and 383.41

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Solution

The fourth proportional to 678.15, 935.87 and 383.41 is: 529.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    678.15 : 935.87 = 383.41 : x
  2. Step 2: Convert to fraction form
    678.15/935.87 = 383.41/x
  3. Step 3: Cross multiply
    678.15x = 935.87 × 383.41
  4. Step 4: Simplify right side
    678.15x = 358,825.96
  5. Step 5: Solve for x
    x = 358,825.96/678.15
  6. Step 6: Final answer
    x = 529.12

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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.