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Finding the Fourth Proportional to 1,364.85, 1,881.02 and 986.65

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Solution

The fourth proportional to 1,364.85, 1,881.02 and 986.65 is: 1,359.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,364.85 : 1,881.02 = 986.65 : x
  2. Step 2: Convert to fraction form
    1,364.85/1,881.02 = 986.65/x
  3. Step 3: Cross multiply
    1,364.85x = 1,881.02 × 986.65
  4. Step 4: Simplify right side
    1,364.85x = 1,855,906.15
  5. Step 5: Solve for x
    x = 1,855,906.15/1,364.85
  6. Step 6: Final answer
    x = 1,359.79

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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.