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Finding the Fourth Proportional to 645.72, 969.44 and 474.40

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Solution

The fourth proportional to 645.72, 969.44 and 474.40 is: 712.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    645.72 : 969.44 = 474.40 : x
  2. Step 2: Convert to fraction form
    645.72/969.44 = 474.40/x
  3. Step 3: Cross multiply
    645.72x = 969.44 × 474.40
  4. Step 4: Simplify right side
    645.72x = 459,902.34
  5. Step 5: Solve for x
    x = 459,902.34/645.72
  6. Step 6: Final answer
    x = 712.23

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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.