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Finding the Fourth Proportional to 889.61, 1,227.60 and 496.55

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Solution

The fourth proportional to 889.61, 1,227.60 and 496.55 is: 685.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    889.61 : 1,227.60 = 496.55 : x
  2. Step 2: Convert to fraction form
    889.61/1,227.60 = 496.55/x
  3. Step 3: Cross multiply
    889.61x = 1,227.60 × 496.55
  4. Step 4: Simplify right side
    889.61x = 609,558.64
  5. Step 5: Solve for x
    x = 609,558.64/889.61
  6. Step 6: Final answer
    x = 685.20

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1.5x scale

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.