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Finding the Fourth Proportional to 319.86, 479.60 and 124.70

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Solution

The fourth proportional to 319.86, 479.60 and 124.70 is: 186.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    319.86 : 479.60 = 124.70 : x
  2. Step 2: Convert to fraction form
    319.86/479.60 = 124.70/x
  3. Step 3: Cross multiply
    319.86x = 479.60 × 124.70
  4. Step 4: Simplify right side
    319.86x = 59,806.12
  5. Step 5: Solve for x
    x = 59,806.12/319.86
  6. Step 6: Final answer
    x = 186.98

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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.