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Finding the Fourth Proportional to 889.40, 1,227.28 and 496.40

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Solution

The fourth proportional to 889.40, 1,227.28 and 496.40 is: 684.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    889.40 : 1,227.28 = 496.40 : x
  2. Step 2: Convert to fraction form
    889.40/1,227.28 = 496.40/x
  3. Step 3: Cross multiply
    889.40x = 1,227.28 × 496.40
  4. Step 4: Simplify right side
    889.40x = 609,221.79
  5. Step 5: Solve for x
    x = 609,221.79/889.40
  6. Step 6: Final answer
    x = 684.98

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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.