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Finding the Fourth Proportional to 609.60, 912.96 and 438.72

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Solution

The fourth proportional to 609.60, 912.96 and 438.72 is: 657.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    609.60 : 912.96 = 438.72 : x
  2. Step 2: Convert to fraction form
    609.60/912.96 = 438.72/x
  3. Step 3: Cross multiply
    609.60x = 912.96 × 438.72
  4. Step 4: Simplify right side
    609.60x = 400,533.81
  5. Step 5: Solve for x
    x = 400,533.81/609.60
  6. Step 6: Final answer
    x = 657.04

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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.