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Finding the Fourth Proportional to 1,172.89, 1,759.62 and 392.90

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Solution

The fourth proportional to 1,172.89, 1,759.62 and 392.90 is: 589.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,172.89 : 1,759.62 = 392.90 : x
  2. Step 2: Convert to fraction form
    1,172.89/1,759.62 = 392.90/x
  3. Step 3: Cross multiply
    1,172.89x = 1,759.62 × 392.90
  4. Step 4: Simplify right side
    1,172.89x = 691,350.46
  5. Step 5: Solve for x
    x = 691,350.46/1,172.89
  6. Step 6: Final answer
    x = 589.44

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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.