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Finding the Fourth Proportional to 803.30, 1,205.76 and 542.48

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Solution

The fourth proportional to 803.30, 1,205.76 and 542.48 is: 814.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    803.30 : 1,205.76 = 542.48 : x
  2. Step 2: Convert to fraction form
    803.30/1,205.76 = 542.48/x
  3. Step 3: Cross multiply
    803.30x = 1,205.76 × 542.48
  4. Step 4: Simplify right side
    803.30x = 654,100.68
  5. Step 5: Solve for x
    x = 654,100.68/803.30
  6. Step 6: Final answer
    x = 814.27

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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.