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Finding the Fourth Proportional to 385.09, 531.40 and 210.40

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Solution

The fourth proportional to 385.09, 531.40 and 210.40 is: 290.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    385.09 : 531.40 = 210.40 : x
  2. Step 2: Convert to fraction form
    385.09/531.40 = 210.40/x
  3. Step 3: Cross multiply
    385.09x = 531.40 × 210.40
  4. Step 4: Simplify right side
    385.09x = 111,802.85
  5. Step 5: Solve for x
    x = 111,802.85/385.09
  6. Step 6: Final answer
    x = 290.33

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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.