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Finding the Fourth Proportional to 899.55, 1,350.20 and 639.86

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Solution

The fourth proportional to 899.55, 1,350.20 and 639.86 is: 960.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    899.55 : 1,350.20 = 639.86 : x
  2. Step 2: Convert to fraction form
    899.55/1,350.20 = 639.86/x
  3. Step 3: Cross multiply
    899.55x = 1,350.20 × 639.86
  4. Step 4: Simplify right side
    899.55x = 863,933.82
  5. Step 5: Solve for x
    x = 863,933.82/899.55
  6. Step 6: Final answer
    x = 960.41

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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.