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Finding the Fourth Proportional to 945.78, 1,305.18 and 531.78

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Solution

The fourth proportional to 945.78, 1,305.18 and 531.78 is: 733.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    945.78 : 1,305.18 = 531.78 : x
  2. Step 2: Convert to fraction form
    945.78/1,305.18 = 531.78/x
  3. Step 3: Cross multiply
    945.78x = 1,305.18 × 531.78
  4. Step 4: Simplify right side
    945.78x = 694,068.62
  5. Step 5: Solve for x
    x = 694,068.62/945.78
  6. Step 6: Final answer
    x = 733.86

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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.