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Finding the Fourth Proportional to 304.80, 457.14 and 138.08

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Solution

The fourth proportional to 304.80, 457.14 and 138.08 is: 207.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    304.80 : 457.14 = 138.08 : x
  2. Step 2: Convert to fraction form
    304.80/457.14 = 138.08/x
  3. Step 3: Cross multiply
    304.80x = 457.14 × 138.08
  4. Step 4: Simplify right side
    304.80x = 63,121.89
  5. Step 5: Solve for x
    x = 63,121.89/304.80
  6. Step 6: Final answer
    x = 207.09

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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.