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Finding the Fourth Proportional to 805.66, 1,111.92 and 456.34

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Solution

The fourth proportional to 805.66, 1,111.92 and 456.34 is: 629.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    805.66 : 1,111.92 = 456.34 : x
  2. Step 2: Convert to fraction form
    805.66/1,111.92 = 456.34/x
  3. Step 3: Cross multiply
    805.66x = 1,111.92 × 456.34
  4. Step 4: Simplify right side
    805.66x = 507,413.57
  5. Step 5: Solve for x
    x = 507,413.57/805.66
  6. Step 6: Final answer
    x = 629.81

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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.