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Finding the Fourth Proportional to 1,161.62, 1,742.50 and 392.12

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Solution

The fourth proportional to 1,161.62, 1,742.50 and 392.12 is: 588.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,161.62 : 1,742.50 = 392.12 : x
  2. Step 2: Convert to fraction form
    1,161.62/1,742.50 = 392.12/x
  3. Step 3: Cross multiply
    1,161.62x = 1,742.50 × 392.12
  4. Step 4: Simplify right side
    1,161.62x = 683,269.10
  5. Step 5: Solve for x
    x = 683,269.10/1,161.62
  6. Step 6: Final answer
    x = 588.20

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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.