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Finding the Fourth Proportional to 387.60, 535.32 and 310.92

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Solution

The fourth proportional to 387.60, 535.32 and 310.92 is: 429.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.60 : 535.32 = 310.92 : x
  2. Step 2: Convert to fraction form
    387.60/535.32 = 310.92/x
  3. Step 3: Cross multiply
    387.60x = 535.32 × 310.92
  4. Step 4: Simplify right side
    387.60x = 166,441.69
  5. Step 5: Solve for x
    x = 166,441.69/387.60
  6. Step 6: Final answer
    x = 429.42

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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.