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Finding the Fourth Proportional to 443.76, 612.47 and 257.22

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Solution

The fourth proportional to 443.76, 612.47 and 257.22 is: 355.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    443.76 : 612.47 = 257.22 : x
  2. Step 2: Convert to fraction form
    443.76/612.47 = 257.22/x
  3. Step 3: Cross multiply
    443.76x = 612.47 × 257.22
  4. Step 4: Simplify right side
    443.76x = 157,539.53
  5. Step 5: Solve for x
    x = 157,539.53/443.76
  6. Step 6: Final answer
    x = 355.01

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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.