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Finding the Fourth Proportional to 889.02, 1,331.72 and 425.39

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Solution

The fourth proportional to 889.02, 1,331.72 and 425.39 is: 637.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    889.02 : 1,331.72 = 425.39 : x
  2. Step 2: Convert to fraction form
    889.02/1,331.72 = 425.39/x
  3. Step 3: Cross multiply
    889.02x = 1,331.72 × 425.39
  4. Step 4: Simplify right side
    889.02x = 566,491.59
  5. Step 5: Solve for x
    x = 566,491.59/889.02
  6. Step 6: Final answer
    x = 637.21

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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.