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Finding the Fourth Proportional to 319.15, 478.77 and 126.64

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Solution

The fourth proportional to 319.15, 478.77 and 126.64 is: 189.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    319.15 : 478.77 = 126.64 : x
  2. Step 2: Convert to fraction form
    319.15/478.77 = 126.64/x
  3. Step 3: Cross multiply
    319.15x = 478.77 × 126.64
  4. Step 4: Simplify right side
    319.15x = 60,631.43
  5. Step 5: Solve for x
    x = 60,631.43/319.15
  6. Step 6: Final answer
    x = 189.98

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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.