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Finding the Fourth Proportional to 1,090.72, 1,636.08 and 846.55

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Solution

The fourth proportional to 1,090.72, 1,636.08 and 846.55 is: 1,269.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,090.72 : 1,636.08 = 846.55 : x
  2. Step 2: Convert to fraction form
    1,090.72/1,636.08 = 846.55/x
  3. Step 3: Cross multiply
    1,090.72x = 1,636.08 × 846.55
  4. Step 4: Simplify right side
    1,090.72x = 1,385,023.52
  5. Step 5: Solve for x
    x = 1,385,023.52/1,090.72
  6. Step 6: Final answer
    x = 1,269.83

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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.