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Finding the Fourth Proportional to 1,281.20, 1,768.86 and 839.84

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Solution

The fourth proportional to 1,281.20, 1,768.86 and 839.84 is: 1,159.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,281.20 : 1,768.86 = 839.84 : x
  2. Step 2: Convert to fraction form
    1,281.20/1,768.86 = 839.84/x
  3. Step 3: Cross multiply
    1,281.20x = 1,768.86 × 839.84
  4. Step 4: Simplify right side
    1,281.20x = 1,485,559.38
  5. Step 5: Solve for x
    x = 1,485,559.38/1,281.20
  6. Step 6: Final answer
    x = 1,159.51

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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.