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Finding the Fourth Proportional to 388.41, 581.40 and 258.14

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Solution

The fourth proportional to 388.41, 581.40 and 258.14 is: 386.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.41 : 581.40 = 258.14 : x
  2. Step 2: Convert to fraction form
    388.41/581.40 = 258.14/x
  3. Step 3: Cross multiply
    388.41x = 581.40 × 258.14
  4. Step 4: Simplify right side
    388.41x = 150,079.69
  5. Step 5: Solve for x
    x = 150,079.69/388.41
  6. Step 6: Final answer
    x = 386.40

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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.