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Finding the Fourth Proportional to 509.31, 759.34 and 478.33

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Solution

The fourth proportional to 509.31, 759.34 and 478.33 is: 713.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    509.31 : 759.34 = 478.33 : x
  2. Step 2: Convert to fraction form
    509.31/759.34 = 478.33/x
  3. Step 3: Cross multiply
    509.31x = 759.34 × 478.33
  4. Step 4: Simplify right side
    509.31x = 363,213.91
  5. Step 5: Solve for x
    x = 363,213.91/509.31
  6. Step 6: Final answer
    x = 713.15

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.