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Finding the Fourth Proportional to 389.76, 585.27 and 243.81

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Solution

The fourth proportional to 389.76, 585.27 and 243.81 is: 366.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    389.76 : 585.27 = 243.81 : x
  2. Step 2: Convert to fraction form
    389.76/585.27 = 243.81/x
  3. Step 3: Cross multiply
    389.76x = 585.27 × 243.81
  4. Step 4: Simplify right side
    389.76x = 142,693.99
  5. Step 5: Solve for x
    x = 142,693.99/389.76
  6. Step 6: Final answer
    x = 366.11

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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.