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Finding the Fourth Proportional to 1,864.65, 2,791.72 and 985.16

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Solution

The fourth proportional to 1,864.65, 2,791.72 and 985.16 is: 1,474.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,864.65 : 2,791.72 = 985.16 : x
  2. Step 2: Convert to fraction form
    1,864.65/2,791.72 = 985.16/x
  3. Step 3: Cross multiply
    1,864.65x = 2,791.72 × 985.16
  4. Step 4: Simplify right side
    1,864.65x = 2,750,293.54
  5. Step 5: Solve for x
    x = 2,750,293.54/1,864.65
  6. Step 6: Final answer
    x = 1,474.96

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.