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Finding the Fourth Proportional to 1,429.94, 2,145.12 and 442.56

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Solution

The fourth proportional to 1,429.94, 2,145.12 and 442.56 is: 663.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,429.94 : 2,145.12 = 442.56 : x
  2. Step 2: Convert to fraction form
    1,429.94/2,145.12 = 442.56/x
  3. Step 3: Cross multiply
    1,429.94x = 2,145.12 × 442.56
  4. Step 4: Simplify right side
    1,429.94x = 949,344.31
  5. Step 5: Solve for x
    x = 949,344.31/1,429.94
  6. Step 6: Final answer
    x = 663.90

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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.