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Finding the Fourth Proportional to 830.45, 1,245.87 and 253.32

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Solution

The fourth proportional to 830.45, 1,245.87 and 253.32 is: 380.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    830.45 : 1,245.87 = 253.32 : x
  2. Step 2: Convert to fraction form
    830.45/1,245.87 = 253.32/x
  3. Step 3: Cross multiply
    830.45x = 1,245.87 × 253.32
  4. Step 4: Simplify right side
    830.45x = 315,603.79
  5. Step 5: Solve for x
    x = 315,603.79/830.45
  6. Step 6: Final answer
    x = 380.04

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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.