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Finding the Fourth Proportional to 289.37, 399.14 and 210.59

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Solution

The fourth proportional to 289.37, 399.14 and 210.59 is: 290.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    289.37 : 399.14 = 210.59 : x
  2. Step 2: Convert to fraction form
    289.37/399.14 = 210.59/x
  3. Step 3: Cross multiply
    289.37x = 399.14 × 210.59
  4. Step 4: Simplify right side
    289.37x = 84,053.42
  5. Step 5: Solve for x
    x = 84,053.42/289.37
  6. Step 6: Final answer
    x = 290.48

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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.