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Finding the Fourth Proportional to 805.55, 1,111.42 and 490.66

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Solution

The fourth proportional to 805.55, 1,111.42 and 490.66 is: 676.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    805.55 : 1,111.42 = 490.66 : x
  2. Step 2: Convert to fraction form
    805.55/1,111.42 = 490.66/x
  3. Step 3: Cross multiply
    805.55x = 1,111.42 × 490.66
  4. Step 4: Simplify right side
    805.55x = 545,327.17
  5. Step 5: Solve for x
    x = 545,327.17/805.55
  6. Step 6: Final answer
    x = 676.97

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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.