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Finding the Fourth Proportional to 678.59, 936.56 and 383.80

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Solution

The fourth proportional to 678.59, 936.56 and 383.80 is: 529.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    678.59 : 936.56 = 383.80 : x
  2. Step 2: Convert to fraction form
    678.59/936.56 = 383.80/x
  3. Step 3: Cross multiply
    678.59x = 936.56 × 383.80
  4. Step 4: Simplify right side
    678.59x = 359,449.47
  5. Step 5: Solve for x
    x = 359,449.47/678.59
  6. Step 6: Final answer
    x = 529.70

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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.