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Finding the Fourth Proportional to 259.32, 388.70 and 143.51

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Solution

The fourth proportional to 259.32, 388.70 and 143.51 is: 215.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    259.32 : 388.70 = 143.51 : x
  2. Step 2: Convert to fraction form
    259.32/388.70 = 143.51/x
  3. Step 3: Cross multiply
    259.32x = 388.70 × 143.51
  4. Step 4: Simplify right side
    259.32x = 55,782.34
  5. Step 5: Solve for x
    x = 55,782.34/259.32
  6. Step 6: Final answer
    x = 215.11

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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.