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Finding the Fourth Proportional to 295.80, 443.16 and 257.40

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Solution

The fourth proportional to 295.80, 443.16 and 257.40 is: 385.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    295.80 : 443.16 = 257.40 : x
  2. Step 2: Convert to fraction form
    295.80/443.16 = 257.40/x
  3. Step 3: Cross multiply
    295.80x = 443.16 × 257.40
  4. Step 4: Simplify right side
    295.80x = 114,069.38
  5. Step 5: Solve for x
    x = 114,069.38/295.80
  6. Step 6: Final answer
    x = 385.63

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.