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Finding the Fourth Proportional to 645.38, 968.11 and 260.63

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Solution

The fourth proportional to 645.38, 968.11 and 260.63 is: 390.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    645.38 : 968.11 = 260.63 : x
  2. Step 2: Convert to fraction form
    645.38/968.11 = 260.63/x
  3. Step 3: Cross multiply
    645.38x = 968.11 × 260.63
  4. Step 4: Simplify right side
    645.38x = 252,318.51
  5. Step 5: Solve for x
    x = 252,318.51/645.38
  6. Step 6: Final answer
    x = 390.96

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Double scale
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1.5x scale

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.