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Finding the Fourth Proportional to 480.42, 719.70 and 285

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Solution

The fourth proportional to 480.42, 719.70 and 285 is: 426.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    480.42 : 719.70 = 285 : x
  2. Step 2: Convert to fraction form
    480.42/719.70 = 285/x
  3. Step 3: Cross multiply
    480.42x = 719.70 × 285
  4. Step 4: Simplify right side
    480.42x = 205,114.50
  5. Step 5: Solve for x
    x = 205,114.50/480.42
  6. Step 6: Final answer
    x = 426.95

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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.