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Finding the Fourth Proportional to 389.83, 537.98 and 212.80

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Solution

The fourth proportional to 389.83, 537.98 and 212.80 is: 293.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    389.83 : 537.98 = 212.80 : x
  2. Step 2: Convert to fraction form
    389.83/537.98 = 212.80/x
  3. Step 3: Cross multiply
    389.83x = 537.98 × 212.80
  4. Step 4: Simplify right side
    389.83x = 114,479.74
  5. Step 5: Solve for x
    x = 114,479.74/389.83
  6. Step 6: Final answer
    x = 293.67

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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.