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Finding the Fourth Proportional to 765.93, 1,057.01 and 451.22

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Solution

The fourth proportional to 765.93, 1,057.01 and 451.22 is: 622.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    765.93 : 1,057.01 = 451.22 : x
  2. Step 2: Convert to fraction form
    765.93/1,057.01 = 451.22/x
  3. Step 3: Cross multiply
    765.93x = 1,057.01 × 451.22
  4. Step 4: Simplify right side
    765.93x = 476,944.05
  5. Step 5: Solve for x
    x = 476,944.05/765.93
  6. Step 6: Final answer
    x = 622.70

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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.