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Finding the Fourth Proportional to 693.59, 1,039.77 and 261.05

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Solution

The fourth proportional to 693.59, 1,039.77 and 261.05 is: 391.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    693.59 : 1,039.77 = 261.05 : x
  2. Step 2: Convert to fraction form
    693.59/1,039.77 = 261.05/x
  3. Step 3: Cross multiply
    693.59x = 1,039.77 × 261.05
  4. Step 4: Simplify right side
    693.59x = 271,426.76
  5. Step 5: Solve for x
    x = 271,426.76/693.59
  6. Step 6: Final answer
    x = 391.34

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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.