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Finding the Fourth Proportional to 1,405.22, 1,939.90 and 908.14

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Solution

The fourth proportional to 1,405.22, 1,939.90 and 908.14 is: 1,253.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,405.22 : 1,939.90 = 908.14 : x
  2. Step 2: Convert to fraction form
    1,405.22/1,939.90 = 908.14/x
  3. Step 3: Cross multiply
    1,405.22x = 1,939.90 × 908.14
  4. Step 4: Simplify right side
    1,405.22x = 1,761,693.55
  5. Step 5: Solve for x
    x = 1,761,693.55/1,405.22
  6. Step 6: Final answer
    x = 1,253.68

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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.