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Finding the Fourth Proportional to 862.45, 1,290.56 and 742.16

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Solution

The fourth proportional to 862.45, 1,290.56 and 742.16 is: 1,110.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    862.45 : 1,290.56 = 742.16 : x
  2. Step 2: Convert to fraction form
    862.45/1,290.56 = 742.16/x
  3. Step 3: Cross multiply
    862.45x = 1,290.56 × 742.16
  4. Step 4: Simplify right side
    862.45x = 957,798.30
  5. Step 5: Solve for x
    x = 957,798.30/862.45
  6. Step 6: Final answer
    x = 1,110.56

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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.