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Finding the Fourth Proportional to 931.80, 1,286.04 and 539.05

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Solution

The fourth proportional to 931.80, 1,286.04 and 539.05 is: 743.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    931.80 : 1,286.04 = 539.05 : x
  2. Step 2: Convert to fraction form
    931.80/1,286.04 = 539.05/x
  3. Step 3: Cross multiply
    931.80x = 1,286.04 × 539.05
  4. Step 4: Simplify right side
    931.80x = 693,239.86
  5. Step 5: Solve for x
    x = 693,239.86/931.80
  6. Step 6: Final answer
    x = 743.98

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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.