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Finding the Fourth Proportional to 607.45, 911.18 and 318.85

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Solution

The fourth proportional to 607.45, 911.18 and 318.85 is: 478.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    607.45 : 911.18 = 318.85 : x
  2. Step 2: Convert to fraction form
    607.45/911.18 = 318.85/x
  3. Step 3: Cross multiply
    607.45x = 911.18 × 318.85
  4. Step 4: Simplify right side
    607.45x = 290,529.74
  5. Step 5: Solve for x
    x = 290,529.74/607.45
  6. Step 6: Final answer
    x = 478.28

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Double scale
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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.