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Finding the Fourth Proportional to 384.86, 531.11 and 210.21

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Solution

The fourth proportional to 384.86, 531.11 and 210.21 is: 290.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    384.86 : 531.11 = 210.21 : x
  2. Step 2: Convert to fraction form
    384.86/531.11 = 210.21/x
  3. Step 3: Cross multiply
    384.86x = 531.11 × 210.21
  4. Step 4: Simplify right side
    384.86x = 111,640.93
  5. Step 5: Solve for x
    x = 111,640.93/384.86
  6. Step 6: Final answer
    x = 290.08

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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.