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Finding the Fourth Proportional to 861.44, 1,290.59 and 553.34

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Solution

The fourth proportional to 861.44, 1,290.59 and 553.34 is: 828.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    861.44 : 1,290.59 = 553.34 : x
  2. Step 2: Convert to fraction form
    861.44/1,290.59 = 553.34/x
  3. Step 3: Cross multiply
    861.44x = 1,290.59 × 553.34
  4. Step 4: Simplify right side
    861.44x = 714,125.85
  5. Step 5: Solve for x
    x = 714,125.85/861.44
  6. Step 6: Final answer
    x = 828.99

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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.