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Finding the Fourth Proportional to 319.99, 479.68 and 157.79

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Solution

The fourth proportional to 319.99, 479.68 and 157.79 is: 236.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    319.99 : 479.68 = 157.79 : x
  2. Step 2: Convert to fraction form
    319.99/479.68 = 157.79/x
  3. Step 3: Cross multiply
    319.99x = 479.68 × 157.79
  4. Step 4: Simplify right side
    319.99x = 75,688.71
  5. Step 5: Solve for x
    x = 75,688.71/319.99
  6. Step 6: Final answer
    x = 236.53

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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.