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Finding the Fourth Proportional to 829.10, 1,143.69 and 479.74

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Solution

The fourth proportional to 829.10, 1,143.69 and 479.74 is: 661.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    829.10 : 1,143.69 = 479.74 : x
  2. Step 2: Convert to fraction form
    829.10/1,143.69 = 479.74/x
  3. Step 3: Cross multiply
    829.10x = 1,143.69 × 479.74
  4. Step 4: Simplify right side
    829.10x = 548,673.84
  5. Step 5: Solve for x
    x = 548,673.84/829.10
  6. Step 6: Final answer
    x = 661.77

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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.