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Finding the Fourth Proportional to 1,161.39, 1,742.16 and 431.02

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Solution

The fourth proportional to 1,161.39, 1,742.16 and 431.02 is: 646.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,161.39 : 1,742.16 = 431.02 : x
  2. Step 2: Convert to fraction form
    1,161.39/1,742.16 = 431.02/x
  3. Step 3: Cross multiply
    1,161.39x = 1,742.16 × 431.02
  4. Step 4: Simplify right side
    1,161.39x = 750,907.17
  5. Step 5: Solve for x
    x = 750,907.17/1,161.39
  6. Step 6: Final answer
    x = 646.56

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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.