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Finding the Fourth Proportional to 389.94, 585.39 and 369.78

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Solution

The fourth proportional to 389.94, 585.39 and 369.78 is: 555.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    389.94 : 585.39 = 369.78 : x
  2. Step 2: Convert to fraction form
    389.94/585.39 = 369.78/x
  3. Step 3: Cross multiply
    389.94x = 585.39 × 369.78
  4. Step 4: Simplify right side
    389.94x = 216,465.51
  5. Step 5: Solve for x
    x = 216,465.51/389.94
  6. Step 6: Final answer
    x = 555.13

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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.