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Finding the Fourth Proportional to 919.68, 1,379.34 and 432.96

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Solution

The fourth proportional to 919.68, 1,379.34 and 432.96 is: 649.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    919.68 : 1,379.34 = 432.96 : x
  2. Step 2: Convert to fraction form
    919.68/1,379.34 = 432.96/x
  3. Step 3: Cross multiply
    919.68x = 1,379.34 × 432.96
  4. Step 4: Simplify right side
    919.68x = 597,199.05
  5. Step 5: Solve for x
    x = 597,199.05/919.68
  6. Step 6: Final answer
    x = 649.36

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Double scale
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1.5x scale

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.