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Finding the Fourth Proportional to 829.71, 1,244.71 and 342.79

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Solution

The fourth proportional to 829.71, 1,244.71 and 342.79 is: 514.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    829.71 : 1,244.71 = 342.79 : x
  2. Step 2: Convert to fraction form
    829.71/1,244.71 = 342.79/x
  3. Step 3: Cross multiply
    829.71x = 1,244.71 × 342.79
  4. Step 4: Simplify right side
    829.71x = 426,674.14
  5. Step 5: Solve for x
    x = 426,674.14/829.71
  6. Step 6: Final answer
    x = 514.24

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.