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Finding the Fourth Proportional to 307.20, 424.12 and 212.83

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Solution

The fourth proportional to 307.20, 424.12 and 212.83 is: 293.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    307.20 : 424.12 = 212.83 : x
  2. Step 2: Convert to fraction form
    307.20/424.12 = 212.83/x
  3. Step 3: Cross multiply
    307.20x = 424.12 × 212.83
  4. Step 4: Simplify right side
    307.20x = 90,265.46
  5. Step 5: Solve for x
    x = 90,265.46/307.20
  6. Step 6: Final answer
    x = 293.83

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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.