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Finding the Fourth Proportional to 1,396.79, 1,927.45 and 865.84

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Solution

The fourth proportional to 1,396.79, 1,927.45 and 865.84 is: 1,194.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,396.79 : 1,927.45 = 865.84 : x
  2. Step 2: Convert to fraction form
    1,396.79/1,927.45 = 865.84/x
  3. Step 3: Cross multiply
    1,396.79x = 1,927.45 × 865.84
  4. Step 4: Simplify right side
    1,396.79x = 1,668,858.32
  5. Step 5: Solve for x
    x = 1,668,858.32/1,396.79
  6. Step 6: Final answer
    x = 1,194.78

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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.