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Finding the Fourth Proportional to 805.91, 1,111.93 and 491.19

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Solution

The fourth proportional to 805.91, 1,111.93 and 491.19 is: 677.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    805.91 : 1,111.93 = 491.19 : x
  2. Step 2: Convert to fraction form
    805.91/1,111.93 = 491.19/x
  3. Step 3: Cross multiply
    805.91x = 1,111.93 × 491.19
  4. Step 4: Simplify right side
    805.91x = 546,168.90
  5. Step 5: Solve for x
    x = 546,168.90/805.91
  6. Step 6: Final answer
    x = 677.70

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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.