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Finding the Fourth Proportional to 889.70, 1,227.78 and 496.76

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Solution

The fourth proportional to 889.70, 1,227.78 and 496.76 is: 685.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    889.70 : 1,227.78 = 496.76 : x
  2. Step 2: Convert to fraction form
    889.70/1,227.78 = 496.76/x
  3. Step 3: Cross multiply
    889.70x = 1,227.78 × 496.76
  4. Step 4: Simplify right side
    889.70x = 609,905.85
  5. Step 5: Solve for x
    x = 609,905.85/889.70
  6. Step 6: Final answer
    x = 685.52

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Double scale
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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.