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Finding the Fourth Proportional to 889.60, 1,227.60 and 496.55

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Solution

The fourth proportional to 889.60, 1,227.60 and 496.55 is: 685.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    889.60 : 1,227.60 = 496.55 : x
  2. Step 2: Convert to fraction form
    889.60/1,227.60 = 496.55/x
  3. Step 3: Cross multiply
    889.60x = 1,227.60 × 496.55
  4. Step 4: Simplify right side
    889.60x = 609,564.78
  5. Step 5: Solve for x
    x = 609,564.78/889.60
  6. Step 6: Final answer
    x = 685.21

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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.