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Finding the Fourth Proportional to 1,105.21, 1,657.30 and 374.59

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Solution

The fourth proportional to 1,105.21, 1,657.30 and 374.59 is: 561.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,105.21 : 1,657.30 = 374.59 : x
  2. Step 2: Convert to fraction form
    1,105.21/1,657.30 = 374.59/x
  3. Step 3: Cross multiply
    1,105.21x = 1,657.30 × 374.59
  4. Step 4: Simplify right side
    1,105.21x = 620,808.01
  5. Step 5: Solve for x
    x = 620,808.01/1,105.21
  6. Step 6: Final answer
    x = 561.71

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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.