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Finding the Fourth Proportional to 1,143.31, 1,577.75 and 645.94

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Solution

The fourth proportional to 1,143.31, 1,577.75 and 645.94 is: 891.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,143.31 : 1,577.75 = 645.94 : x
  2. Step 2: Convert to fraction form
    1,143.31/1,577.75 = 645.94/x
  3. Step 3: Cross multiply
    1,143.31x = 1,577.75 × 645.94
  4. Step 4: Simplify right side
    1,143.31x = 1,019,123.95
  5. Step 5: Solve for x
    x = 1,019,123.95/1,143.31
  6. Step 6: Final answer
    x = 891.38

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.