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Finding the Fourth Proportional to 852.31, 1,176.96 and 685.99

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Solution

The fourth proportional to 852.31, 1,176.96 and 685.99 is: 947.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    852.31 : 1,176.96 = 685.99 : x
  2. Step 2: Convert to fraction form
    852.31/1,176.96 = 685.99/x
  3. Step 3: Cross multiply
    852.31x = 1,176.96 × 685.99
  4. Step 4: Simplify right side
    852.31x = 807,382.79
  5. Step 5: Solve for x
    x = 807,382.79/852.31
  6. Step 6: Final answer
    x = 947.29

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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.