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Finding the Fourth Proportional to 1,423.84, 1,964.50 and 919.71

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Solution

The fourth proportional to 1,423.84, 1,964.50 and 919.71 is: 1,268.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,423.84 : 1,964.50 = 919.71 : x
  2. Step 2: Convert to fraction form
    1,423.84/1,964.50 = 919.71/x
  3. Step 3: Cross multiply
    1,423.84x = 1,964.50 × 919.71
  4. Step 4: Simplify right side
    1,423.84x = 1,806,770.96
  5. Step 5: Solve for x
    x = 1,806,770.96/1,423.84
  6. Step 6: Final answer
    x = 1,268.95

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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.