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Finding the Fourth Proportional to 319.55, 479.15 and 103.10

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Solution

The fourth proportional to 319.55, 479.15 and 103.10 is: 154.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    319.55 : 479.15 = 103.10 : x
  2. Step 2: Convert to fraction form
    319.55/479.15 = 103.10/x
  3. Step 3: Cross multiply
    319.55x = 479.15 × 103.10
  4. Step 4: Simplify right side
    319.55x = 49,397.45
  5. Step 5: Solve for x
    x = 49,397.45/319.55
  6. Step 6: Final answer
    x = 154.59

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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.