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Finding the Fourth Proportional to 388, 581.70 and 171.46

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Solution

The fourth proportional to 388, 581.70 and 171.46 is: 257.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    388 : 581.70 = 171.46 : x
  2. Step 2: Convert to fraction form
    388/581.70 = 171.46/x
  3. Step 3: Cross multiply
    388x = 581.70 × 171.46
  4. Step 4: Simplify right side
    388x = 99,738.28
  5. Step 5: Solve for x
    x = 99,738.28/388
  6. Step 6: Final answer
    x = 257.06

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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.