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Finding the Fourth Proportional to 890.79, 1,229.28 and 497.81

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Solution

The fourth proportional to 890.79, 1,229.28 and 497.81 is: 686.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    890.79 : 1,229.28 = 497.81 : x
  2. Step 2: Convert to fraction form
    890.79/1,229.28 = 497.81/x
  3. Step 3: Cross multiply
    890.79x = 1,229.28 × 497.81
  4. Step 4: Simplify right side
    890.79x = 611,947.88
  5. Step 5: Solve for x
    x = 611,947.88/890.79
  6. Step 6: Final answer
    x = 686.97

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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.