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Finding the Fourth Proportional to 245.34, 368.12 and 212.87

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Solution

The fourth proportional to 245.34, 368.12 and 212.87 is: 319.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    245.34 : 368.12 = 212.87 : x
  2. Step 2: Convert to fraction form
    245.34/368.12 = 212.87/x
  3. Step 3: Cross multiply
    245.34x = 368.12 × 212.87
  4. Step 4: Simplify right side
    245.34x = 78,361.70
  5. Step 5: Solve for x
    x = 78,361.70/245.34
  6. Step 6: Final answer
    x = 319.40

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.