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Finding the Fourth Proportional to 1,318.79, 1,820.52 and 847.37

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Solution

The fourth proportional to 1,318.79, 1,820.52 and 847.37 is: 1,169.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,318.79 : 1,820.52 = 847.37 : x
  2. Step 2: Convert to fraction form
    1,318.79/1,820.52 = 847.37/x
  3. Step 3: Cross multiply
    1,318.79x = 1,820.52 × 847.37
  4. Step 4: Simplify right side
    1,318.79x = 1,542,644.93
  5. Step 5: Solve for x
    x = 1,542,644.93/1,318.79
  6. Step 6: Final answer
    x = 1,169.75

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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.