Home / 1,353.20-2,029.37-428.52

Finding the Fourth Proportional to 1,353.20, 2,029.37 and 428.52

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Solution

The fourth proportional to 1,353.20, 2,029.37 and 428.52 is: 642.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,353.20 : 2,029.37 = 428.52 : x
  2. Step 2: Convert to fraction form
    1,353.20/2,029.37 = 428.52/x
  3. Step 3: Cross multiply
    1,353.20x = 2,029.37 × 428.52
  4. Step 4: Simplify right side
    1,353.20x = 869,623.49
  5. Step 5: Solve for x
    x = 869,623.49/1,353.20
  6. Step 6: Final answer
    x = 642.64

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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.