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Finding the Fourth Proportional to 678, 936.18 and 530.38

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Solution

The fourth proportional to 678, 936.18 and 530.38 is: 732.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    678 : 936.18 = 530.38 : x
  2. Step 2: Convert to fraction form
    678/936.18 = 530.38/x
  3. Step 3: Cross multiply
    678x = 936.18 × 530.38
  4. Step 4: Simplify right side
    678x = 496,531.15
  5. Step 5: Solve for x
    x = 496,531.15/678
  6. Step 6: Final answer
    x = 732.35

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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.