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Finding the Fourth Proportional to 919.29, 1,378.56 and 456.90

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Solution

The fourth proportional to 919.29, 1,378.56 and 456.90 is: 685.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    919.29 : 1,378.56 = 456.90 : x
  2. Step 2: Convert to fraction form
    919.29/1,378.56 = 456.90/x
  3. Step 3: Cross multiply
    919.29x = 1,378.56 × 456.90
  4. Step 4: Simplify right side
    919.29x = 629,864.06
  5. Step 5: Solve for x
    x = 629,864.06/919.29
  6. Step 6: Final answer
    x = 685.16

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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.