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Finding the Fourth Proportional to 805.58, 1,111.38 and 490.88

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Solution

The fourth proportional to 805.58, 1,111.38 and 490.88 is: 677.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    805.58 : 1,111.38 = 490.88 : x
  2. Step 2: Convert to fraction form
    805.58/1,111.38 = 490.88/x
  3. Step 3: Cross multiply
    805.58x = 1,111.38 × 490.88
  4. Step 4: Simplify right side
    805.58x = 545,554.21
  5. Step 5: Solve for x
    x = 545,554.21/805.58
  6. Step 6: Final answer
    x = 677.22

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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.