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Finding the Fourth Proportional to 304.90, 457.28 and 142.50

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Solution

The fourth proportional to 304.90, 457.28 and 142.50 is: 213.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    304.90 : 457.28 = 142.50 : x
  2. Step 2: Convert to fraction form
    304.90/457.28 = 142.50/x
  3. Step 3: Cross multiply
    304.90x = 457.28 × 142.50
  4. Step 4: Simplify right side
    304.90x = 65,162.40
  5. Step 5: Solve for x
    x = 65,162.40/304.90
  6. Step 6: Final answer
    x = 213.72

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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.