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Finding the Fourth Proportional to 645.40, 968.11 and 158.45

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Solution

The fourth proportional to 645.40, 968.11 and 158.45 is: 237.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    645.40 : 968.11 = 158.45 : x
  2. Step 2: Convert to fraction form
    645.40/968.11 = 158.45/x
  3. Step 3: Cross multiply
    645.40x = 968.11 × 158.45
  4. Step 4: Simplify right side
    645.40x = 153,397.03
  5. Step 5: Solve for x
    x = 153,397.03/645.40
  6. Step 6: Final answer
    x = 237.68

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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.