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Finding the Fourth Proportional to 393.17, 585.95 and 389.93

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Solution

The fourth proportional to 393.17, 585.95 and 389.93 is: 581.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.17 : 585.95 = 389.93 : x
  2. Step 2: Convert to fraction form
    393.17/585.95 = 389.93/x
  3. Step 3: Cross multiply
    393.17x = 585.95 × 389.93
  4. Step 4: Simplify right side
    393.17x = 228,474.60
  5. Step 5: Solve for x
    x = 228,474.60/393.17
  6. Step 6: Final answer
    x = 581.12

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.