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Finding the Fourth Proportional to 1,123.44, 1,684.32 and 775.79

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Solution

The fourth proportional to 1,123.44, 1,684.32 and 775.79 is: 1,163.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,123.44 : 1,684.32 = 775.79 : x
  2. Step 2: Convert to fraction form
    1,123.44/1,684.32 = 775.79/x
  3. Step 3: Cross multiply
    1,123.44x = 1,684.32 × 775.79
  4. Step 4: Simplify right side
    1,123.44x = 1,306,670.19
  5. Step 5: Solve for x
    x = 1,306,670.19/1,123.44
  6. Step 6: Final answer
    x = 1,163.10

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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.