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Finding the Fourth Proportional to 387.62, 581.95 and 258.45

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Solution

The fourth proportional to 387.62, 581.95 and 258.45 is: 388.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.62 : 581.95 = 258.45 : x
  2. Step 2: Convert to fraction form
    387.62/581.95 = 258.45/x
  3. Step 3: Cross multiply
    387.62x = 581.95 × 258.45
  4. Step 4: Simplify right side
    387.62x = 150,406.12
  5. Step 5: Solve for x
    x = 150,406.12/387.62
  6. Step 6: Final answer
    x = 388.02

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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.