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Finding the Fourth Proportional to 305.02, 457.39 and 142.75

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Solution

The fourth proportional to 305.02, 457.39 and 142.75 is: 214.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    305.02 : 457.39 = 142.75 : x
  2. Step 2: Convert to fraction form
    305.02/457.39 = 142.75/x
  3. Step 3: Cross multiply
    305.02x = 457.39 × 142.75
  4. Step 4: Simplify right side
    305.02x = 65,292.42
  5. Step 5: Solve for x
    x = 65,292.42/305.02
  6. Step 6: Final answer
    x = 214.06

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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.