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Finding the Fourth Proportional to 378.95, 522.05 and 312.12

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Solution

The fourth proportional to 378.95, 522.05 and 312.12 is: 429.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    378.95 : 522.05 = 312.12 : x
  2. Step 2: Convert to fraction form
    378.95/522.05 = 312.12/x
  3. Step 3: Cross multiply
    378.95x = 522.05 × 312.12
  4. Step 4: Simplify right side
    378.95x = 162,940.69
  5. Step 5: Solve for x
    x = 162,940.69/378.95
  6. Step 6: Final answer
    x = 429.99

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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.