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Finding the Fourth Proportional to 857.30, 1,183.11 and 484.30

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Solution

The fourth proportional to 857.30, 1,183.11 and 484.30 is: 668.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    857.30 : 1,183.11 = 484.30 : x
  2. Step 2: Convert to fraction form
    857.30/1,183.11 = 484.30/x
  3. Step 3: Cross multiply
    857.30x = 1,183.11 × 484.30
  4. Step 4: Simplify right side
    857.30x = 572,974.26
  5. Step 5: Solve for x
    x = 572,974.26/857.30
  6. Step 6: Final answer
    x = 668.35

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1.5x scale

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.