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Finding the Fourth Proportional to 304.99, 457.50 and 85.63

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Solution

The fourth proportional to 304.99, 457.50 and 85.63 is: 128.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    304.99 : 457.50 = 85.63 : x
  2. Step 2: Convert to fraction form
    304.99/457.50 = 85.63/x
  3. Step 3: Cross multiply
    304.99x = 457.50 × 85.63
  4. Step 4: Simplify right side
    304.99x = 39,175.73
  5. Step 5: Solve for x
    x = 39,175.73/304.99
  6. Step 6: Final answer
    x = 128.45

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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.