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Finding the Fourth Proportional to 388.81, 583.30 and 215.73

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Solution

The fourth proportional to 388.81, 583.30 and 215.73 is: 323.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.81 : 583.30 = 215.73 : x
  2. Step 2: Convert to fraction form
    388.81/583.30 = 215.73/x
  3. Step 3: Cross multiply
    388.81x = 583.30 × 215.73
  4. Step 4: Simplify right side
    388.81x = 125,834.77
  5. Step 5: Solve for x
    x = 125,834.77/388.81
  6. Step 6: Final answer
    x = 323.64

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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.