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Finding the Fourth Proportional to 387.78, 582.47 and 377.55

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Solution

The fourth proportional to 387.78, 582.47 and 377.55 is: 567.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.78 : 582.47 = 377.55 : x
  2. Step 2: Convert to fraction form
    387.78/582.47 = 377.55/x
  3. Step 3: Cross multiply
    387.78x = 582.47 × 377.55
  4. Step 4: Simplify right side
    387.78x = 219,911.55
  5. Step 5: Solve for x
    x = 219,911.55/387.78
  6. Step 6: Final answer
    x = 567.10

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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.