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Finding the Fourth Proportional to 443.61, 612.12 and 257.11

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Solution

The fourth proportional to 443.61, 612.12 and 257.11 is: 354.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    443.61 : 612.12 = 257.11 : x
  2. Step 2: Convert to fraction form
    443.61/612.12 = 257.11/x
  3. Step 3: Cross multiply
    443.61x = 612.12 × 257.11
  4. Step 4: Simplify right side
    443.61x = 157,381.61
  5. Step 5: Solve for x
    x = 157,381.61/443.61
  6. Step 6: Final answer
    x = 354.77

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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.