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Finding the Fourth Proportional to 313.52, 431.96 and 284.40

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Solution

The fourth proportional to 313.52, 431.96 and 284.40 is: 391.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    313.52 : 431.96 = 284.40 : x
  2. Step 2: Convert to fraction form
    313.52/431.96 = 284.40/x
  3. Step 3: Cross multiply
    313.52x = 431.96 × 284.40
  4. Step 4: Simplify right side
    313.52x = 122,849.42
  5. Step 5: Solve for x
    x = 122,849.42/313.52
  6. Step 6: Final answer
    x = 391.84

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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.