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Finding the Fourth Proportional to 531.45, 733.80 and 391.77

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Solution

The fourth proportional to 531.45, 733.80 and 391.77 is: 540.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    531.45 : 733.80 = 391.77 : x
  2. Step 2: Convert to fraction form
    531.45/733.80 = 391.77/x
  3. Step 3: Cross multiply
    531.45x = 733.80 × 391.77
  4. Step 4: Simplify right side
    531.45x = 287,480.83
  5. Step 5: Solve for x
    x = 287,480.83/531.45
  6. Step 6: Final answer
    x = 540.94

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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.