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Finding the Fourth Proportional to 479.86, 719.76 and 155.20

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Solution

The fourth proportional to 479.86, 719.76 and 155.20 is: 232.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    479.86 : 719.76 = 155.20 : x
  2. Step 2: Convert to fraction form
    479.86/719.76 = 155.20/x
  3. Step 3: Cross multiply
    479.86x = 719.76 × 155.20
  4. Step 4: Simplify right side
    479.86x = 111,706.75
  5. Step 5: Solve for x
    x = 111,706.75/479.86
  6. Step 6: Final answer
    x = 232.79

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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.