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Finding the Fourth Proportional to 829.72, 1,145.08 and 534.80

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Solution

The fourth proportional to 829.72, 1,145.08 and 534.80 is: 738.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    829.72 : 1,145.08 = 534.80 : x
  2. Step 2: Convert to fraction form
    829.72/1,145.08 = 534.80/x
  3. Step 3: Cross multiply
    829.72x = 1,145.08 × 534.80
  4. Step 4: Simplify right side
    829.72x = 612,388.78
  5. Step 5: Solve for x
    x = 612,388.78/829.72
  6. Step 6: Final answer
    x = 738.07

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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.