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Finding the Fourth Proportional to 387.10, 533.99 and 231.74

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Solution

The fourth proportional to 387.10, 533.99 and 231.74 is: 319.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.10 : 533.99 = 231.74 : x
  2. Step 2: Convert to fraction form
    387.10/533.99 = 231.74/x
  3. Step 3: Cross multiply
    387.10x = 533.99 × 231.74
  4. Step 4: Simplify right side
    387.10x = 123,746.84
  5. Step 5: Solve for x
    x = 123,746.84/387.10
  6. Step 6: Final answer
    x = 319.68

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.