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Finding the Fourth Proportional to 919.42, 1,378.86 and 508.48

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Solution

The fourth proportional to 919.42, 1,378.86 and 508.48 is: 762.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    919.42 : 1,378.86 = 508.48 : x
  2. Step 2: Convert to fraction form
    919.42/1,378.86 = 508.48/x
  3. Step 3: Cross multiply
    919.42x = 1,378.86 × 508.48
  4. Step 4: Simplify right side
    919.42x = 701,122.73
  5. Step 5: Solve for x
    x = 701,122.73/919.42
  6. Step 6: Final answer
    x = 762.57

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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.