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Finding the Fourth Proportional to 319.08, 478.30 and 145.79

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Solution

The fourth proportional to 319.08, 478.30 and 145.79 is: 218.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    319.08 : 478.30 = 145.79 : x
  2. Step 2: Convert to fraction form
    319.08/478.30 = 145.79/x
  3. Step 3: Cross multiply
    319.08x = 478.30 × 145.79
  4. Step 4: Simplify right side
    319.08x = 69,731.36
  5. Step 5: Solve for x
    x = 69,731.36/319.08
  6. Step 6: Final answer
    x = 218.54

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.