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Finding the Fourth Proportional to 388.90, 583.42 and 172.48

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Solution

The fourth proportional to 388.90, 583.42 and 172.48 is: 258.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.90 : 583.42 = 172.48 : x
  2. Step 2: Convert to fraction form
    388.90/583.42 = 172.48/x
  3. Step 3: Cross multiply
    388.90x = 583.42 × 172.48
  4. Step 4: Simplify right side
    388.90x = 100,628.28
  5. Step 5: Solve for x
    x = 100,628.28/388.90
  6. Step 6: Final answer
    x = 258.75

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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.