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Finding the Fourth Proportional to 890.57, 1,227.87 and 558.87

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Solution

The fourth proportional to 890.57, 1,227.87 and 558.87 is: 770.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    890.57 : 1,227.87 = 558.87 : x
  2. Step 2: Convert to fraction form
    890.57/1,227.87 = 558.87/x
  3. Step 3: Cross multiply
    890.57x = 1,227.87 × 558.87
  4. Step 4: Simplify right side
    890.57x = 686,219.71
  5. Step 5: Solve for x
    x = 686,219.71/890.57
  6. Step 6: Final answer
    x = 770.54

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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.