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Finding the Fourth Proportional to 830.85, 1,245.91 and 253.59

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Solution

The fourth proportional to 830.85, 1,245.91 and 253.59 is: 380.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    830.85 : 1,245.91 = 253.59 : x
  2. Step 2: Convert to fraction form
    830.85/1,245.91 = 253.59/x
  3. Step 3: Cross multiply
    830.85x = 1,245.91 × 253.59
  4. Step 4: Simplify right side
    830.85x = 315,950.32
  5. Step 5: Solve for x
    x = 315,950.32/830.85
  6. Step 6: Final answer
    x = 380.27

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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.