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Finding the Fourth Proportional to 383.40, 575.43 and 210.21

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Solution

The fourth proportional to 383.40, 575.43 and 210.21 is: 315.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    383.40 : 575.43 = 210.21 : x
  2. Step 2: Convert to fraction form
    383.40/575.43 = 210.21/x
  3. Step 3: Cross multiply
    383.40x = 575.43 × 210.21
  4. Step 4: Simplify right side
    383.40x = 120,961.14
  5. Step 5: Solve for x
    x = 120,961.14/383.40
  6. Step 6: Final answer
    x = 315.50

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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.