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Finding the Fourth Proportional to 1,281.65, 1,922.51 and 845.69

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Solution

The fourth proportional to 1,281.65, 1,922.51 and 845.69 is: 1,268.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,281.65 : 1,922.51 = 845.69 : x
  2. Step 2: Convert to fraction form
    1,281.65/1,922.51 = 845.69/x
  3. Step 3: Cross multiply
    1,281.65x = 1,922.51 × 845.69
  4. Step 4: Simplify right side
    1,281.65x = 1,625,839.98
  5. Step 5: Solve for x
    x = 1,625,839.98/1,281.65
  6. Step 6: Final answer
    x = 1,268.56

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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.