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Finding the Fourth Proportional to 293.14, 439.28 and 128.46

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Solution

The fourth proportional to 293.14, 439.28 and 128.46 is: 192.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    293.14 : 439.28 = 128.46 : x
  2. Step 2: Convert to fraction form
    293.14/439.28 = 128.46/x
  3. Step 3: Cross multiply
    293.14x = 439.28 × 128.46
  4. Step 4: Simplify right side
    293.14x = 56,429.91
  5. Step 5: Solve for x
    x = 56,429.91/293.14
  6. Step 6: Final answer
    x = 192.50

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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.