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Finding the Fourth Proportional to 342.75, 472.02 and 312

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Solution

The fourth proportional to 342.75, 472.02 and 312 is: 429.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    342.75 : 472.02 = 312 : x
  2. Step 2: Convert to fraction form
    342.75/472.02 = 312/x
  3. Step 3: Cross multiply
    342.75x = 472.02 × 312
  4. Step 4: Simplify right side
    342.75x = 147,270.24
  5. Step 5: Solve for x
    x = 147,270.24/342.75
  6. Step 6: Final answer
    x = 429.67

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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.