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Finding the Fourth Proportional to 509.50, 702.89 and 391.27

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Solution

The fourth proportional to 509.50, 702.89 and 391.27 is: 539.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    509.50 : 702.89 = 391.27 : x
  2. Step 2: Convert to fraction form
    509.50/702.89 = 391.27/x
  3. Step 3: Cross multiply
    509.50x = 702.89 × 391.27
  4. Step 4: Simplify right side
    509.50x = 275,019.77
  5. Step 5: Solve for x
    x = 275,019.77/509.50
  6. Step 6: Final answer
    x = 539.78

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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.