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Finding the Fourth Proportional to 443.79, 612.45 and 257.29

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Solution

The fourth proportional to 443.79, 612.45 and 257.29 is: 355.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    443.79 : 612.45 = 257.29 : x
  2. Step 2: Convert to fraction form
    443.79/612.45 = 257.29/x
  3. Step 3: Cross multiply
    443.79x = 612.45 × 257.29
  4. Step 4: Simplify right side
    443.79x = 157,574.20
  5. Step 5: Solve for x
    x = 157,574.20/443.79
  6. Step 6: Final answer
    x = 355.07

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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.