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Finding the Fourth Proportional to 862.44, 1,290.78 and 707.88

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Solution

The fourth proportional to 862.44, 1,290.78 and 707.88 is: 1,059.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    862.44 : 1,290.78 = 707.88 : x
  2. Step 2: Convert to fraction form
    862.44/1,290.78 = 707.88/x
  3. Step 3: Cross multiply
    862.44x = 1,290.78 × 707.88
  4. Step 4: Simplify right side
    862.44x = 913,717.35
  5. Step 5: Solve for x
    x = 913,717.35/862.44
  6. Step 6: Final answer
    x = 1,059.46

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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.