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Finding the Fourth Proportional to 890.84, 1,229.44 and 497.90

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Solution

The fourth proportional to 890.84, 1,229.44 and 497.90 is: 687.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    890.84 : 1,229.44 = 497.90 : x
  2. Step 2: Convert to fraction form
    890.84/1,229.44 = 497.90/x
  3. Step 3: Cross multiply
    890.84x = 1,229.44 × 497.90
  4. Step 4: Simplify right side
    890.84x = 612,138.18
  5. Step 5: Solve for x
    x = 612,138.18/890.84
  6. Step 6: Final answer
    x = 687.15

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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.