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Finding the Fourth Proportional to 315.80, 443.20 and 315.80

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Solution

The fourth proportional to 315.80, 443.20 and 315.80 is: 443.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    315.80 : 443.20 = 315.80 : x
  2. Step 2: Convert to fraction form
    315.80/443.20 = 315.80/x
  3. Step 3: Cross multiply
    315.80x = 443.20 × 315.80
  4. Step 4: Simplify right side
    315.80x = 139,962.56
  5. Step 5: Solve for x
    x = 139,962.56/315.80
  6. Step 6: Final answer
    x = 443.20

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Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.