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Finding the Fourth Proportional to 385.03, 531.36 and 210.39

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Solution

The fourth proportional to 385.03, 531.36 and 210.39 is: 290.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    385.03 : 531.36 = 210.39 : x
  2. Step 2: Convert to fraction form
    385.03/531.36 = 210.39/x
  3. Step 3: Cross multiply
    385.03x = 531.36 × 210.39
  4. Step 4: Simplify right side
    385.03x = 111,792.83
  5. Step 5: Solve for x
    x = 111,792.83/385.03
  6. Step 6: Final answer
    x = 290.35

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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.