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Finding the Fourth Proportional to 825.79, 1,237.57 and 305.30

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Solution

The fourth proportional to 825.79, 1,237.57 and 305.30 is: 457.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    825.79 : 1,237.57 = 305.30 : x
  2. Step 2: Convert to fraction form
    825.79/1,237.57 = 305.30/x
  3. Step 3: Cross multiply
    825.79x = 1,237.57 × 305.30
  4. Step 4: Simplify right side
    825.79x = 377,830.12
  5. Step 5: Solve for x
    x = 377,830.12/825.79
  6. Step 6: Final answer
    x = 457.54

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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.