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Finding the Fourth Proportional to 905.69, 1,360.20 and 542.70

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Solution

The fourth proportional to 905.69, 1,360.20 and 542.70 is: 815.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    905.69 : 1,360.20 = 542.70 : x
  2. Step 2: Convert to fraction form
    905.69/1,360.20 = 542.70/x
  3. Step 3: Cross multiply
    905.69x = 1,360.20 × 542.70
  4. Step 4: Simplify right side
    905.69x = 738,177.83
  5. Step 5: Solve for x
    x = 738,177.83/905.69
  6. Step 6: Final answer
    x = 815.05

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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.