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Finding the Fourth Proportional to 821.79, 1,134.07 and 490.23

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Solution

The fourth proportional to 821.79, 1,134.07 and 490.23 is: 676.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    821.79 : 1,134.07 = 490.23 : x
  2. Step 2: Convert to fraction form
    821.79/1,134.07 = 490.23/x
  3. Step 3: Cross multiply
    821.79x = 1,134.07 × 490.23
  4. Step 4: Simplify right side
    821.79x = 555,953.91
  5. Step 5: Solve for x
    x = 555,953.91/821.79
  6. Step 6: Final answer
    x = 676.52

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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.