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Finding the Fourth Proportional to 352.86, 487.35 and 287.70

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Solution

The fourth proportional to 352.86, 487.35 and 287.70 is: 397.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    352.86 : 487.35 = 287.70 : x
  2. Step 2: Convert to fraction form
    352.86/487.35 = 287.70/x
  3. Step 3: Cross multiply
    352.86x = 487.35 × 287.70
  4. Step 4: Simplify right side
    352.86x = 140,210.60
  5. Step 5: Solve for x
    x = 140,210.60/352.86
  6. Step 6: Final answer
    x = 397.35

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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.