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Finding the Fourth Proportional to 1,384.70, 1,910.79 and 860.63

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Solution

The fourth proportional to 1,384.70, 1,910.79 and 860.63 is: 1,187.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,384.70 : 1,910.79 = 860.63 : x
  2. Step 2: Convert to fraction form
    1,384.70/1,910.79 = 860.63/x
  3. Step 3: Cross multiply
    1,384.70x = 1,910.79 × 860.63
  4. Step 4: Simplify right side
    1,384.70x = 1,644,473.64
  5. Step 5: Solve for x
    x = 1,644,473.64/1,384.70
  6. Step 6: Final answer
    x = 1,187.61

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1.5x scale

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.