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Finding the Fourth Proportional to 393.30, 589.61 and 210.83

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Solution

The fourth proportional to 393.30, 589.61 and 210.83 is: 316.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.30 : 589.61 = 210.83 : x
  2. Step 2: Convert to fraction form
    393.30/589.61 = 210.83/x
  3. Step 3: Cross multiply
    393.30x = 589.61 × 210.83
  4. Step 4: Simplify right side
    393.30x = 124,303.47
  5. Step 5: Solve for x
    x = 124,303.47/393.30
  6. Step 6: Final answer
    x = 316.05

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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.