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Finding the Fourth Proportional to 1,438.91, 1,986.06 and 849.63

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Solution

The fourth proportional to 1,438.91, 1,986.06 and 849.63 is: 1,172.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,438.91 : 1,986.06 = 849.63 : x
  2. Step 2: Convert to fraction form
    1,438.91/1,986.06 = 849.63/x
  3. Step 3: Cross multiply
    1,438.91x = 1,986.06 × 849.63
  4. Step 4: Simplify right side
    1,438.91x = 1,687,416.16
  5. Step 5: Solve for x
    x = 1,687,416.16/1,438.91
  6. Step 6: Final answer
    x = 1,172.70

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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.