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Finding the Fourth Proportional to 805.23, 1,111.76 and 543.15

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Solution

The fourth proportional to 805.23, 1,111.76 and 543.15 is: 749.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    805.23 : 1,111.76 = 543.15 : x
  2. Step 2: Convert to fraction form
    805.23/1,111.76 = 543.15/x
  3. Step 3: Cross multiply
    805.23x = 1,111.76 × 543.15
  4. Step 4: Simplify right side
    805.23x = 603,849.73
  5. Step 5: Solve for x
    x = 603,849.73/805.23
  6. Step 6: Final answer
    x = 749.91

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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.