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Finding the Fourth Proportional to 890.28, 1,228.66 and 558.60

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Solution

The fourth proportional to 890.28, 1,228.66 and 558.60 is: 770.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    890.28 : 1,228.66 = 558.60 : x
  2. Step 2: Convert to fraction form
    890.28/1,228.66 = 558.60/x
  3. Step 3: Cross multiply
    890.28x = 1,228.66 × 558.60
  4. Step 4: Simplify right side
    890.28x = 686,329.48
  5. Step 5: Solve for x
    x = 686,329.48/890.28
  6. Step 6: Final answer
    x = 770.91

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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.