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Finding the Fourth Proportional to 1,145.96, 1,719.42 and 561.48

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Solution

The fourth proportional to 1,145.96, 1,719.42 and 561.48 is: 842.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,145.96 : 1,719.42 = 561.48 : x
  2. Step 2: Convert to fraction form
    1,145.96/1,719.42 = 561.48/x
  3. Step 3: Cross multiply
    1,145.96x = 1,719.42 × 561.48
  4. Step 4: Simplify right side
    1,145.96x = 965,419.94
  5. Step 5: Solve for x
    x = 965,419.94/1,145.96
  6. Step 6: Final answer
    x = 842.46

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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.