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Finding the Fourth Proportional to 1,438.65, 1,985.22 and 879.39

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Solution

The fourth proportional to 1,438.65, 1,985.22 and 879.39 is: 1,213.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,438.65 : 1,985.22 = 879.39 : x
  2. Step 2: Convert to fraction form
    1,438.65/1,985.22 = 879.39/x
  3. Step 3: Cross multiply
    1,438.65x = 1,985.22 × 879.39
  4. Step 4: Simplify right side
    1,438.65x = 1,745,782.62
  5. Step 5: Solve for x
    x = 1,745,782.62/1,438.65
  6. Step 6: Final answer
    x = 1,213.49

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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.