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Finding the Fourth Proportional to 389.56, 583.43 and 215.95

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Solution

The fourth proportional to 389.56, 583.43 and 215.95 is: 323.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    389.56 : 583.43 = 215.95 : x
  2. Step 2: Convert to fraction form
    389.56/583.43 = 215.95/x
  3. Step 3: Cross multiply
    389.56x = 583.43 × 215.95
  4. Step 4: Simplify right side
    389.56x = 125,989.17
  5. Step 5: Solve for x
    x = 125,989.17/389.56
  6. Step 6: Final answer
    x = 323.42

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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.