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Finding the Fourth Proportional to 889.36, 1,225.82 and 640.30

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Solution

The fourth proportional to 889.36, 1,225.82 and 640.30 is: 882.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    889.36 : 1,225.82 = 640.30 : x
  2. Step 2: Convert to fraction form
    889.36/1,225.82 = 640.30/x
  3. Step 3: Cross multiply
    889.36x = 1,225.82 × 640.30
  4. Step 4: Simplify right side
    889.36x = 784,892.55
  5. Step 5: Solve for x
    x = 784,892.55/889.36
  6. Step 6: Final answer
    x = 882.54

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.