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Finding the Fourth Proportional to 857.12, 1,182.90 and 484.18

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Solution

The fourth proportional to 857.12, 1,182.90 and 484.18 is: 668.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    857.12 : 1,182.90 = 484.18 : x
  2. Step 2: Convert to fraction form
    857.12/1,182.90 = 484.18/x
  3. Step 3: Cross multiply
    857.12x = 1,182.90 × 484.18
  4. Step 4: Simplify right side
    857.12x = 572,733.56
  5. Step 5: Solve for x
    x = 572,733.56/857.12
  6. Step 6: Final answer
    x = 668.21

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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.