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Finding the Fourth Proportional to 919.26, 1,379.58 and 611.76

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Solution

The fourth proportional to 919.26, 1,379.58 and 611.76 is: 918.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    919.26 : 1,379.58 = 611.76 : x
  2. Step 2: Convert to fraction form
    919.26/1,379.58 = 611.76/x
  3. Step 3: Cross multiply
    919.26x = 1,379.58 × 611.76
  4. Step 4: Simplify right side
    919.26x = 843,971.86
  5. Step 5: Solve for x
    x = 843,971.86/919.26
  6. Step 6: Final answer
    x = 918.10

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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.