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Finding the Fourth Proportional to 1,186.74, 1,639.88 and 906.48

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Solution

The fourth proportional to 1,186.74, 1,639.88 and 906.48 is: 1,252.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,186.74 : 1,639.88 = 906.48 : x
  2. Step 2: Convert to fraction form
    1,186.74/1,639.88 = 906.48/x
  3. Step 3: Cross multiply
    1,186.74x = 1,639.88 × 906.48
  4. Step 4: Simplify right side
    1,186.74x = 1,486,518.42
  5. Step 5: Solve for x
    x = 1,486,518.42/1,186.74
  6. Step 6: Final answer
    x = 1,252.61

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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.