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Finding the Fourth Proportional to 1,353.60, 2,029.41 and 428.64

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Solution

The fourth proportional to 1,353.60, 2,029.41 and 428.64 is: 642.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,353.60 : 2,029.41 = 428.64 : x
  2. Step 2: Convert to fraction form
    1,353.60/2,029.41 = 428.64/x
  3. Step 3: Cross multiply
    1,353.60x = 2,029.41 × 428.64
  4. Step 4: Simplify right side
    1,353.60x = 869,886.30
  5. Step 5: Solve for x
    x = 869,886.30/1,353.60
  6. Step 6: Final answer
    x = 642.65

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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.