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Finding the Fourth Proportional to 857.10, 1,182.79 and 464.12

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Solution

The fourth proportional to 857.10, 1,182.79 and 464.12 is: 640.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    857.10 : 1,182.79 = 464.12 : x
  2. Step 2: Convert to fraction form
    857.10/1,182.79 = 464.12/x
  3. Step 3: Cross multiply
    857.10x = 1,182.79 × 464.12
  4. Step 4: Simplify right side
    857.10x = 548,958.29
  5. Step 5: Solve for x
    x = 548,958.29/857.10
  6. Step 6: Final answer
    x = 640.48

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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.