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Finding the Fourth Proportional to 817.99, 1,225.90 and 384.55

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Solution

The fourth proportional to 817.99, 1,225.90 and 384.55 is: 576.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    817.99 : 1,225.90 = 384.55 : x
  2. Step 2: Convert to fraction form
    817.99/1,225.90 = 384.55/x
  3. Step 3: Cross multiply
    817.99x = 1,225.90 × 384.55
  4. Step 4: Simplify right side
    817.99x = 471,419.85
  5. Step 5: Solve for x
    x = 471,419.85/817.99
  6. Step 6: Final answer
    x = 576.31

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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.