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Finding the Fourth Proportional to 919.17, 1,378.29 and 456.42

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Solution

The fourth proportional to 919.17, 1,378.29 and 456.42 is: 684.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    919.17 : 1,378.29 = 456.42 : x
  2. Step 2: Convert to fraction form
    919.17/1,378.29 = 456.42/x
  3. Step 3: Cross multiply
    919.17x = 1,378.29 × 456.42
  4. Step 4: Simplify right side
    919.17x = 629,079.12
  5. Step 5: Solve for x
    x = 629,079.12/919.17
  6. Step 6: Final answer
    x = 684.40

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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.