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Finding the Fourth Proportional to 1,172.70, 1,759.37 and 392.83

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Solution

The fourth proportional to 1,172.70, 1,759.37 and 392.83 is: 589.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,172.70 : 1,759.37 = 392.83 : x
  2. Step 2: Convert to fraction form
    1,172.70/1,759.37 = 392.83/x
  3. Step 3: Cross multiply
    1,172.70x = 1,759.37 × 392.83
  4. Step 4: Simplify right side
    1,172.70x = 691,133.32
  5. Step 5: Solve for x
    x = 691,133.32/1,172.70
  6. Step 6: Final answer
    x = 589.35

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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.