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Finding the Fourth Proportional to 352.79, 487.04 and 315.86

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Solution

The fourth proportional to 352.79, 487.04 and 315.86 is: 436.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    352.79 : 487.04 = 315.86 : x
  2. Step 2: Convert to fraction form
    352.79/487.04 = 315.86/x
  3. Step 3: Cross multiply
    352.79x = 487.04 × 315.86
  4. Step 4: Simplify right side
    352.79x = 153,832.44
  5. Step 5: Solve for x
    x = 153,832.44/352.79
  6. Step 6: Final answer
    x = 436.05

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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.