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Finding the Fourth Proportional to 889.80, 1,334.70 and 427.47

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Solution

The fourth proportional to 889.80, 1,334.70 and 427.47 is: 641.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    889.80 : 1,334.70 = 427.47 : x
  2. Step 2: Convert to fraction form
    889.80/1,334.70 = 427.47/x
  3. Step 3: Cross multiply
    889.80x = 1,334.70 × 427.47
  4. Step 4: Simplify right side
    889.80x = 570,544.21
  5. Step 5: Solve for x
    x = 570,544.21/889.80
  6. Step 6: Final answer
    x = 641.21

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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.