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Finding the Fourth Proportional to 1,438.77, 1,985.25 and 849.49

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Solution

The fourth proportional to 1,438.77, 1,985.25 and 849.49 is: 1,172.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,438.77 : 1,985.25 = 849.49 : x
  2. Step 2: Convert to fraction form
    1,438.77/1,985.25 = 849.49/x
  3. Step 3: Cross multiply
    1,438.77x = 1,985.25 × 849.49
  4. Step 4: Simplify right side
    1,438.77x = 1,686,450.02
  5. Step 5: Solve for x
    x = 1,686,450.02/1,438.77
  6. Step 6: Final answer
    x = 1,172.15

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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.