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Finding the Fourth Proportional to 919.99, 1,379.80 and 575.45

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Solution

The fourth proportional to 919.99, 1,379.80 and 575.45 is: 863.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    919.99 : 1,379.80 = 575.45 : x
  2. Step 2: Convert to fraction form
    919.99/1,379.80 = 575.45/x
  3. Step 3: Cross multiply
    919.99x = 1,379.80 × 575.45
  4. Step 4: Simplify right side
    919.99x = 794,004.90
  5. Step 5: Solve for x
    x = 794,004.90/919.99
  6. Step 6: Final answer
    x = 863.06

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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.