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Finding the Fourth Proportional to 1,115.61, 1,674.63 and 764.48

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Solution

The fourth proportional to 1,115.61, 1,674.63 and 764.48 is: 1,147.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,115.61 : 1,674.63 = 764.48 : x
  2. Step 2: Convert to fraction form
    1,115.61/1,674.63 = 764.48/x
  3. Step 3: Cross multiply
    1,115.61x = 1,674.63 × 764.48
  4. Step 4: Simplify right side
    1,115.61x = 1,280,212.77
  5. Step 5: Solve for x
    x = 1,280,212.77/1,115.61
  6. Step 6: Final answer
    x = 1,147.55

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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.