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Finding the Fourth Proportional to 315.90, 471.91 and 228.49

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Solution

The fourth proportional to 315.90, 471.91 and 228.49 is: 341.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    315.90 : 471.91 = 228.49 : x
  2. Step 2: Convert to fraction form
    315.90/471.91 = 228.49/x
  3. Step 3: Cross multiply
    315.90x = 471.91 × 228.49
  4. Step 4: Simplify right side
    315.90x = 107,823.21
  5. Step 5: Solve for x
    x = 107,823.21/315.90
  6. Step 6: Final answer
    x = 341.32

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.