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Finding the Fourth Proportional to 985.05, 1,359.86 and 671.94

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Solution

The fourth proportional to 985.05, 1,359.86 and 671.94 is: 927.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    985.05 : 1,359.86 = 671.94 : x
  2. Step 2: Convert to fraction form
    985.05/1,359.86 = 671.94/x
  3. Step 3: Cross multiply
    985.05x = 1,359.86 × 671.94
  4. Step 4: Simplify right side
    985.05x = 913,740.97
  5. Step 5: Solve for x
    x = 913,740.97/985.05
  6. Step 6: Final answer
    x = 927.61

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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.