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Finding the Fourth Proportional to 1,052.20, 1,578.24 and 321.72

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Solution

The fourth proportional to 1,052.20, 1,578.24 and 321.72 is: 482.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,052.20 : 1,578.24 = 321.72 : x
  2. Step 2: Convert to fraction form
    1,052.20/1,578.24 = 321.72/x
  3. Step 3: Cross multiply
    1,052.20x = 1,578.24 × 321.72
  4. Step 4: Simplify right side
    1,052.20x = 507,741.87
  5. Step 5: Solve for x
    x = 507,741.87/1,052.20
  6. Step 6: Final answer
    x = 482.55

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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.