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Finding the Fourth Proportional to 1,105.12, 1,657.68 and 283.39

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Solution

The fourth proportional to 1,105.12, 1,657.68 and 283.39 is: 425.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,105.12 : 1,657.68 = 283.39 : x
  2. Step 2: Convert to fraction form
    1,105.12/1,657.68 = 283.39/x
  3. Step 3: Cross multiply
    1,105.12x = 1,657.68 × 283.39
  4. Step 4: Simplify right side
    1,105.12x = 469,772.66
  5. Step 5: Solve for x
    x = 469,772.66/1,105.12
  6. Step 6: Final answer
    x = 425.09

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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.