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Finding the Fourth Proportional to 368.79, 508.57 and 281.31

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Solution

The fourth proportional to 368.79, 508.57 and 281.31 is: 387.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    368.79 : 508.57 = 281.31 : x
  2. Step 2: Convert to fraction form
    368.79/508.57 = 281.31/x
  3. Step 3: Cross multiply
    368.79x = 508.57 × 281.31
  4. Step 4: Simplify right side
    368.79x = 143,065.83
  5. Step 5: Solve for x
    x = 143,065.83/368.79
  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.