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Finding the Fourth Proportional to 1,295.56, 1,943.39 and 429.85

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Solution

The fourth proportional to 1,295.56, 1,943.39 and 429.85 is: 644.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,295.56 : 1,943.39 = 429.85 : x
  2. Step 2: Convert to fraction form
    1,295.56/1,943.39 = 429.85/x
  3. Step 3: Cross multiply
    1,295.56x = 1,943.39 × 429.85
  4. Step 4: Simplify right side
    1,295.56x = 835,366.19
  5. Step 5: Solve for x
    x = 835,366.19/1,295.56
  6. Step 6: Final answer
    x = 644.79

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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.