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Finding the Fourth Proportional to 889.55, 1,227.39 and 557.99

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Solution

The fourth proportional to 889.55, 1,227.39 and 557.99 is: 769.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    889.55 : 1,227.39 = 557.99 : x
  2. Step 2: Convert to fraction form
    889.55/1,227.39 = 557.99/x
  3. Step 3: Cross multiply
    889.55x = 1,227.39 × 557.99
  4. Step 4: Simplify right side
    889.55x = 684,871.35
  5. Step 5: Solve for x
    x = 684,871.35/889.55
  6. Step 6: Final answer
    x = 769.91

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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.