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Finding the Fourth Proportional to 443.86, 612.50 and 257.40

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Solution

The fourth proportional to 443.86, 612.50 and 257.40 is: 355.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    443.86 : 612.50 = 257.40 : x
  2. Step 2: Convert to fraction form
    443.86/612.50 = 257.40/x
  3. Step 3: Cross multiply
    443.86x = 612.50 × 257.40
  4. Step 4: Simplify right side
    443.86x = 157,656.21
  5. Step 5: Solve for x
    x = 157,656.21/443.86
  6. Step 6: Final answer
    x = 355.20

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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.