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Finding the Fourth Proportional to 806.66, 1,112.34 and 609.86

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Solution

The fourth proportional to 806.66, 1,112.34 and 609.86 is: 840.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    806.66 : 1,112.34 = 609.86 : x
  2. Step 2: Convert to fraction form
    806.66/1,112.34 = 609.86/x
  3. Step 3: Cross multiply
    806.66x = 1,112.34 × 609.86
  4. Step 4: Simplify right side
    806.66x = 678,371.67
  5. Step 5: Solve for x
    x = 678,371.67/806.66
  6. Step 6: Final answer
    x = 840.96

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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.