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Finding the Fourth Proportional to 1,105.18, 1,657.56 and 643.86

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Solution

The fourth proportional to 1,105.18, 1,657.56 and 643.86 is: 965.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,105.18 : 1,657.56 = 643.86 : x
  2. Step 2: Convert to fraction form
    1,105.18/1,657.56 = 643.86/x
  3. Step 3: Cross multiply
    1,105.18x = 1,657.56 × 643.86
  4. Step 4: Simplify right side
    1,105.18x = 1,067,236.58
  5. Step 5: Solve for x
    x = 1,067,236.58/1,105.18
  6. Step 6: Final answer
    x = 965.67

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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.