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Finding the Fourth Proportional to 385.16, 531.54 and 210.50

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Solution

The fourth proportional to 385.16, 531.54 and 210.50 is: 290.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    385.16 : 531.54 = 210.50 : x
  2. Step 2: Convert to fraction form
    385.16/531.54 = 210.50/x
  3. Step 3: Cross multiply
    385.16x = 531.54 × 210.50
  4. Step 4: Simplify right side
    385.16x = 111,888.12
  5. Step 5: Solve for x
    x = 111,888.12/385.16
  6. Step 6: Final answer
    x = 290.50

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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.