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Finding the Fourth Proportional to 585.61, 808.83 and 388.78

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Solution

The fourth proportional to 585.61, 808.83 and 388.78 is: 536.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    585.61 : 808.83 = 388.78 : x
  2. Step 2: Convert to fraction form
    585.61/808.83 = 388.78/x
  3. Step 3: Cross multiply
    585.61x = 808.83 × 388.78
  4. Step 4: Simplify right side
    585.61x = 314,456.93
  5. Step 5: Solve for x
    x = 314,456.93/585.61
  6. Step 6: Final answer
    x = 536.97

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.