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Finding the Fourth Proportional to 259.70, 389.12 and 143.87

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Solution

The fourth proportional to 259.70, 389.12 and 143.87 is: 215.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    259.70 : 389.12 = 143.87 : x
  2. Step 2: Convert to fraction form
    259.70/389.12 = 143.87/x
  3. Step 3: Cross multiply
    259.70x = 389.12 × 143.87
  4. Step 4: Simplify right side
    259.70x = 55,980.03
  5. Step 5: Solve for x
    x = 55,980.03/259.70
  6. Step 6: Final answer
    x = 215.56

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.