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Finding the Fourth Proportional to 1,185.85, 1,636.23 and 906.40

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Solution

The fourth proportional to 1,185.85, 1,636.23 and 906.40 is: 1,250.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,185.85 : 1,636.23 = 906.40 : x
  2. Step 2: Convert to fraction form
    1,185.85/1,636.23 = 906.40/x
  3. Step 3: Cross multiply
    1,185.85x = 1,636.23 × 906.40
  4. Step 4: Simplify right side
    1,185.85x = 1,483,078.87
  5. Step 5: Solve for x
    x = 1,483,078.87/1,185.85
  6. Step 6: Final answer
    x = 1,250.65

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.