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Finding the Fourth Proportional to 447.30, 617.40 and 307.88

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Solution

The fourth proportional to 447.30, 617.40 and 307.88 is: 424.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    447.30 : 617.40 = 307.88 : x
  2. Step 2: Convert to fraction form
    447.30/617.40 = 307.88/x
  3. Step 3: Cross multiply
    447.30x = 617.40 × 307.88
  4. Step 4: Simplify right side
    447.30x = 190,085.11
  5. Step 5: Solve for x
    x = 190,085.11/447.30
  6. Step 6: Final answer
    x = 424.96

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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.