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Finding the Fourth Proportional to 285.80, 393.95 and 212.00

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Solution

The fourth proportional to 285.80, 393.95 and 212.00 is: 292.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    285.80 : 393.95 = 212.00 : x
  2. Step 2: Convert to fraction form
    285.80/393.95 = 212.00/x
  3. Step 3: Cross multiply
    285.80x = 393.95 × 212.00
  4. Step 4: Simplify right side
    285.80x = 83,515.96
  5. Step 5: Solve for x
    x = 83,515.96/285.80
  6. Step 6: Final answer
    x = 292.22

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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.