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Finding the Fourth Proportional to 1,291,905.64, 1,780,982.13 and 908,743.24

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Solution

The fourth proportional to 1,291,905.64, 1,780,982.13 and 908,743.24 is: 1,252,766.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,291,905.64 : 1,780,982.13 = 908,743.24 : x
  2. Step 2: Convert to fraction form
    1,291,905.64/1,780,982.13 = 908,743.24/x
  3. Step 3: Cross multiply
    1,291,905.64x = 1,780,982.13 × 908,743.24
  4. Step 4: Simplify right side
    1,291,905.64x = 1,618,455,471,198.30
  5. Step 5: Solve for x
    x = 1,618,455,471,198.30/1,291,905.64
  6. Step 6: Final answer
    x = 1,252,766.01

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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.