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Finding the Fourth Proportional to 890.26, 1,228.08 and 558.62

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Solution

The fourth proportional to 890.26, 1,228.08 and 558.62 is: 770.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    890.26 : 1,228.08 = 558.62 : x
  2. Step 2: Convert to fraction form
    890.26/1,228.08 = 558.62/x
  3. Step 3: Cross multiply
    890.26x = 1,228.08 × 558.62
  4. Step 4: Simplify right side
    890.26x = 686,030.05
  5. Step 5: Solve for x
    x = 686,030.05/890.26
  6. Step 6: Final answer
    x = 770.60

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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.