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Finding the Fourth Proportional to 1,296.05, 1,942.83 and 429.75

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Solution

The fourth proportional to 1,296.05, 1,942.83 and 429.75 is: 644.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,296.05 : 1,942.83 = 429.75 : x
  2. Step 2: Convert to fraction form
    1,296.05/1,942.83 = 429.75/x
  3. Step 3: Cross multiply
    1,296.05x = 1,942.83 × 429.75
  4. Step 4: Simplify right side
    1,296.05x = 834,931.19
  5. Step 5: Solve for x
    x = 834,931.19/1,296.05
  6. Step 6: Final answer
    x = 644.21

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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.