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Finding the Fourth Proportional to 1,161.38, 1,742.24 and 339.55

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Solution

The fourth proportional to 1,161.38, 1,742.24 and 339.55 is: 509.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,161.38 : 1,742.24 = 339.55 : x
  2. Step 2: Convert to fraction form
    1,161.38/1,742.24 = 339.55/x
  3. Step 3: Cross multiply
    1,161.38x = 1,742.24 × 339.55
  4. Step 4: Simplify right side
    1,161.38x = 591,577.59
  5. Step 5: Solve for x
    x = 591,577.59/1,161.38
  6. Step 6: Final answer
    x = 509.37

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1.5x scale

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.