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Finding the Fourth Proportional to 890.12, 1,228.26 and 591.32

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Solution

The fourth proportional to 890.12, 1,228.26 and 591.32 is: 815.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    890.12 : 1,228.26 = 591.32 : x
  2. Step 2: Convert to fraction form
    890.12/1,228.26 = 591.32/x
  3. Step 3: Cross multiply
    890.12x = 1,228.26 × 591.32
  4. Step 4: Simplify right side
    890.12x = 726,294.70
  5. Step 5: Solve for x
    x = 726,294.70/890.12
  6. Step 6: Final answer
    x = 815.95

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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.