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Finding the Fourth Proportional to 443.40, 612.48 and 355.08

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Solution

The fourth proportional to 443.40, 612.48 and 355.08 is: 490.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    443.40 : 612.48 = 355.08 : x
  2. Step 2: Convert to fraction form
    443.40/612.48 = 355.08/x
  3. Step 3: Cross multiply
    443.40x = 612.48 × 355.08
  4. Step 4: Simplify right side
    443.40x = 217,479.40
  5. Step 5: Solve for x
    x = 217,479.40/443.40
  6. Step 6: Final answer
    x = 490.48

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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.