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Finding the Fourth Proportional to 985.06, 1,359.39 and 764.31

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Solution

The fourth proportional to 985.06, 1,359.39 and 764.31 is: 1,054.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    985.06 : 1,359.39 = 764.31 : x
  2. Step 2: Convert to fraction form
    985.06/1,359.39 = 764.31/x
  3. Step 3: Cross multiply
    985.06x = 1,359.39 × 764.31
  4. Step 4: Simplify right side
    985.06x = 1,038,995.37
  5. Step 5: Solve for x
    x = 1,038,995.37/985.06
  6. Step 6: Final answer
    x = 1,054.75

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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.