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Finding the Fourth Proportional to 645.87, 968.72 and 207.08

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Solution

The fourth proportional to 645.87, 968.72 and 207.08 is: 310.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    645.87 : 968.72 = 207.08 : x
  2. Step 2: Convert to fraction form
    645.87/968.72 = 207.08/x
  3. Step 3: Cross multiply
    645.87x = 968.72 × 207.08
  4. Step 4: Simplify right side
    645.87x = 200,602.54
  5. Step 5: Solve for x
    x = 200,602.54/645.87
  6. Step 6: Final answer
    x = 310.59

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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.