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Finding the Fourth Proportional to 1,108.82, 1,664.26 and 561.39

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Solution

The fourth proportional to 1,108.82, 1,664.26 and 561.39 is: 842.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,108.82 : 1,664.26 = 561.39 : x
  2. Step 2: Convert to fraction form
    1,108.82/1,664.26 = 561.39/x
  3. Step 3: Cross multiply
    1,108.82x = 1,664.26 × 561.39
  4. Step 4: Simplify right side
    1,108.82x = 934,294.40
  5. Step 5: Solve for x
    x = 934,294.40/1,108.82
  6. Step 6: Final answer
    x = 842.60

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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.