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Finding the Fourth Proportional to 805.49, 1,111.48 and 451.38

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Solution

The fourth proportional to 805.49, 1,111.48 and 451.38 is: 622.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    805.49 : 1,111.48 = 451.38 : x
  2. Step 2: Convert to fraction form
    805.49/1,111.48 = 451.38/x
  3. Step 3: Cross multiply
    805.49x = 1,111.48 × 451.38
  4. Step 4: Simplify right side
    805.49x = 501,698.71
  5. Step 5: Solve for x
    x = 501,698.71/805.49
  6. Step 6: Final answer
    x = 622.85

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Half scale
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Double scale
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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.