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Finding the Fourth Proportional to 900.26, 1,347.02 and 640.86

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Solution

The fourth proportional to 900.26, 1,347.02 and 640.86 is: 958.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    900.26 : 1,347.02 = 640.86 : x
  2. Step 2: Convert to fraction form
    900.26/1,347.02 = 640.86/x
  3. Step 3: Cross multiply
    900.26x = 1,347.02 × 640.86
  4. Step 4: Simplify right side
    900.26x = 863,244.50
  5. Step 5: Solve for x
    x = 863,244.50/900.26
  6. Step 6: Final answer
    x = 958.88

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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.