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Finding the Fourth Proportional to 919.92, 1,379.58 and 432.66

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Solution

The fourth proportional to 919.92, 1,379.58 and 432.66 is: 648.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    919.92 : 1,379.58 = 432.66 : x
  2. Step 2: Convert to fraction form
    919.92/1,379.58 = 432.66/x
  3. Step 3: Cross multiply
    919.92x = 1,379.58 × 432.66
  4. Step 4: Simplify right side
    919.92x = 596,889.08
  5. Step 5: Solve for x
    x = 596,889.08/919.92
  6. Step 6: Final answer
    x = 648.85

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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.