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Finding the Fourth Proportional to 1,384, 1,909.12 and 879.67

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Solution

The fourth proportional to 1,384, 1,909.12 and 879.67 is: 1,213.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,384 : 1,909.12 = 879.67 : x
  2. Step 2: Convert to fraction form
    1,384/1,909.12 = 879.67/x
  3. Step 3: Cross multiply
    1,384x = 1,909.12 × 879.67
  4. Step 4: Simplify right side
    1,384x = 1,679,395.59
  5. Step 5: Solve for x
    x = 1,679,395.59/1,384
  6. Step 6: Final answer
    x = 1,213.44

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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.