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Finding the Fourth Proportional to 986.22, 1,359.81 and 653.94

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Solution

The fourth proportional to 986.22, 1,359.81 and 653.94 is: 901.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    986.22 : 1,359.81 = 653.94 : x
  2. Step 2: Convert to fraction form
    986.22/1,359.81 = 653.94/x
  3. Step 3: Cross multiply
    986.22x = 1,359.81 × 653.94
  4. Step 4: Simplify right side
    986.22x = 889,234.15
  5. Step 5: Solve for x
    x = 889,234.15/986.22
  6. Step 6: Final answer
    x = 901.66

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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.