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Finding the Fourth Proportional to 811,657.64, 1,217,652.53 and 279,109.51

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Solution

The fourth proportional to 811,657.64, 1,217,652.53 and 279,109.51 is: 418,721.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    811,657.64 : 1,217,652.53 = 279,109.51 : x
  2. Step 2: Convert to fraction form
    811,657.64/1,217,652.53 = 279,109.51/x
  3. Step 3: Cross multiply
    811,657.64x = 1,217,652.53 × 279,109.51
  4. Step 4: Simplify right side
    811,657.64x = 339,858,396,558.88
  5. Step 5: Solve for x
    x = 339,858,396,558.88/811,657.64
  6. Step 6: Final answer
    x = 418,721.37

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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.