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Finding the Fourth Proportional to 1,103.70, 1,656.63 and 841.26

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Solution

The fourth proportional to 1,103.70, 1,656.63 and 841.26 is: 1,262.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,103.70 : 1,656.63 = 841.26 : x
  2. Step 2: Convert to fraction form
    1,103.70/1,656.63 = 841.26/x
  3. Step 3: Cross multiply
    1,103.70x = 1,656.63 × 841.26
  4. Step 4: Simplify right side
    1,103.70x = 1,393,656.55
  5. Step 5: Solve for x
    x = 1,393,656.55/1,103.70
  6. Step 6: Final answer
    x = 1,262.71

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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.