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Finding the Fourth Proportional to 208.60, 312.93 and 64.28

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Solution

The fourth proportional to 208.60, 312.93 and 64.28 is: 96.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    208.60 : 312.93 = 64.28 : x
  2. Step 2: Convert to fraction form
    208.60/312.93 = 64.28/x
  3. Step 3: Cross multiply
    208.60x = 312.93 × 64.28
  4. Step 4: Simplify right side
    208.60x = 20,115.14
  5. Step 5: Solve for x
    x = 20,115.14/208.60
  6. Step 6: Final answer
    x = 96.43

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.