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Finding the Fourth Proportional to 890.79, 1,229.28 and 492.45

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Solution

The fourth proportional to 890.79, 1,229.28 and 492.45 is: 679.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    890.79 : 1,229.28 = 492.45 : x
  2. Step 2: Convert to fraction form
    890.79/1,229.28 = 492.45/x
  3. Step 3: Cross multiply
    890.79x = 1,229.28 × 492.45
  4. Step 4: Simplify right side
    890.79x = 605,358.94
  5. Step 5: Solve for x
    x = 605,358.94/890.79
  6. Step 6: Final answer
    x = 679.58

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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.