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Finding the Fourth Proportional to 1,384.08, 1,910.70 and 860.43

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Solution

The fourth proportional to 1,384.08, 1,910.70 and 860.43 is: 1,187.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,384.08 : 1,910.70 = 860.43 : x
  2. Step 2: Convert to fraction form
    1,384.08/1,910.70 = 860.43/x
  3. Step 3: Cross multiply
    1,384.08x = 1,910.70 × 860.43
  4. Step 4: Simplify right side
    1,384.08x = 1,644,023.60
  5. Step 5: Solve for x
    x = 1,644,023.60/1,384.08
  6. Step 6: Final answer
    x = 1,187.81

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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.