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Finding the Fourth Proportional to 764.42, 1,141.56 and 618.35

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Solution

The fourth proportional to 764.42, 1,141.56 and 618.35 is: 923.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    764.42 : 1,141.56 = 618.35 : x
  2. Step 2: Convert to fraction form
    764.42/1,141.56 = 618.35/x
  3. Step 3: Cross multiply
    764.42x = 1,141.56 × 618.35
  4. Step 4: Simplify right side
    764.42x = 705,877.92
  5. Step 5: Solve for x
    x = 705,877.92/764.42
  6. Step 6: Final answer
    x = 923.42

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.