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Finding the Fourth Proportional to 447.76, 617.36 and 307.60

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Solution

The fourth proportional to 447.76, 617.36 and 307.60 is: 424.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    447.76 : 617.36 = 307.60 : x
  2. Step 2: Convert to fraction form
    447.76/617.36 = 307.60/x
  3. Step 3: Cross multiply
    447.76x = 617.36 × 307.60
  4. Step 4: Simplify right side
    447.76x = 189,899.94
  5. Step 5: Solve for x
    x = 189,899.94/447.76
  6. Step 6: Final answer
    x = 424.11

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.