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Finding the Fourth Proportional to 305.45, 457.89 and 140.75

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Solution

The fourth proportional to 305.45, 457.89 and 140.75 is: 210.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    305.45 : 457.89 = 140.75 : x
  2. Step 2: Convert to fraction form
    305.45/457.89 = 140.75/x
  3. Step 3: Cross multiply
    305.45x = 457.89 × 140.75
  4. Step 4: Simplify right side
    305.45x = 64,448.02
  5. Step 5: Solve for x
    x = 64,448.02/305.45
  6. Step 6: Final answer
    x = 210.99

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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.