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Finding the Fourth Proportional to 368.69, 508.61 and 281.21

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Solution

The fourth proportional to 368.69, 508.61 and 281.21 is: 387.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    368.69 : 508.61 = 281.21 : x
  2. Step 2: Convert to fraction form
    368.69/508.61 = 281.21/x
  3. Step 3: Cross multiply
    368.69x = 508.61 × 281.21
  4. Step 4: Simplify right side
    368.69x = 143,024.81
  5. Step 5: Solve for x
    x = 143,024.81/368.69
  6. Step 6: Final answer
    x = 387.93

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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.