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Finding the Fourth Proportional to 665.60, 912.96 and 662.40

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Solution

The fourth proportional to 665.60, 912.96 and 662.40 is: 908.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    665.60 : 912.96 = 662.40 : x
  2. Step 2: Convert to fraction form
    665.60/912.96 = 662.40/x
  3. Step 3: Cross multiply
    665.60x = 912.96 × 662.40
  4. Step 4: Simplify right side
    665.60x = 604,744.70
  5. Step 5: Solve for x
    x = 604,744.70/665.60
  6. Step 6: Final answer
    x = 908.57

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.