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Finding the Fourth Proportional to 678.40, 936.23 and 531.70

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Solution

The fourth proportional to 678.40, 936.23 and 531.70 is: 733.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    678.40 : 936.23 = 531.70 : x
  2. Step 2: Convert to fraction form
    678.40/936.23 = 531.70/x
  3. Step 3: Cross multiply
    678.40x = 936.23 × 531.70
  4. Step 4: Simplify right side
    678.40x = 497,788.49
  5. Step 5: Solve for x
    x = 497,788.49/678.40
  6. Step 6: Final answer
    x = 733.77

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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.