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Finding the Fourth Proportional to 919.20, 1,377.60 and 662.40

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Solution

The fourth proportional to 919.20, 1,377.60 and 662.40 is: 992.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    919.20 : 1,377.60 = 662.40 : x
  2. Step 2: Convert to fraction form
    919.20/1,377.60 = 662.40/x
  3. Step 3: Cross multiply
    919.20x = 1,377.60 × 662.40
  4. Step 4: Simplify right side
    919.20x = 912,522.24
  5. Step 5: Solve for x
    x = 912,522.24/919.20
  6. Step 6: Final answer
    x = 992.74

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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.