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Finding the Fourth Proportional to 678.03, 935.69 and 383.30

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Solution

The fourth proportional to 678.03, 935.69 and 383.30 is: 528.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    678.03 : 935.69 = 383.30 : x
  2. Step 2: Convert to fraction form
    678.03/935.69 = 383.30/x
  3. Step 3: Cross multiply
    678.03x = 935.69 × 383.30
  4. Step 4: Simplify right side
    678.03x = 358,649.98
  5. Step 5: Solve for x
    x = 358,649.98/678.03
  6. Step 6: Final answer
    x = 528.96

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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.