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Finding the Fourth Proportional to 319.91, 479.87 and 103.50

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Solution

The fourth proportional to 319.91, 479.87 and 103.50 is: 155.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    319.91 : 479.87 = 103.50 : x
  2. Step 2: Convert to fraction form
    319.91/479.87 = 103.50/x
  3. Step 3: Cross multiply
    319.91x = 479.87 × 103.50
  4. Step 4: Simplify right side
    319.91x = 49,666.03
  5. Step 5: Solve for x
    x = 49,666.03/319.91
  6. Step 6: Final answer
    x = 155.25

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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.