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Finding the Fourth Proportional to 1,285.20, 1,926.84 and 919.76

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Solution

The fourth proportional to 1,285.20, 1,926.84 and 919.76 is: 1,378.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,285.20 : 1,926.84 = 919.76 : x
  2. Step 2: Convert to fraction form
    1,285.20/1,926.84 = 919.76/x
  3. Step 3: Cross multiply
    1,285.20x = 1,926.84 × 919.76
  4. Step 4: Simplify right side
    1,285.20x = 1,772,230.36
  5. Step 5: Solve for x
    x = 1,772,230.36/1,285.20
  6. Step 6: Final answer
    x = 1,378.95

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.