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Finding the Fourth Proportional to 805.56, 1,111.56 and 451.40

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Solution

The fourth proportional to 805.56, 1,111.56 and 451.40 is: 622.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    805.56 : 1,111.56 = 451.40 : x
  2. Step 2: Convert to fraction form
    805.56/1,111.56 = 451.40/x
  3. Step 3: Cross multiply
    805.56x = 1,111.56 × 451.40
  4. Step 4: Simplify right side
    805.56x = 501,758.18
  5. Step 5: Solve for x
    x = 501,758.18/805.56
  6. Step 6: Final answer
    x = 622.87

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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.