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Finding the Fourth Proportional to 349.90, 482.45 and 305.48

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Solution

The fourth proportional to 349.90, 482.45 and 305.48 is: 421.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    349.90 : 482.45 = 305.48 : x
  2. Step 2: Convert to fraction form
    349.90/482.45 = 305.48/x
  3. Step 3: Cross multiply
    349.90x = 482.45 × 305.48
  4. Step 4: Simplify right side
    349.90x = 147,378.50
  5. Step 5: Solve for x
    x = 147,378.50/349.90
  6. Step 6: Final answer
    x = 421.20

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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.