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Finding the Fourth Proportional to 387.69, 580.62 and 305.98

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Solution

The fourth proportional to 387.69, 580.62 and 305.98 is: 458.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.69 : 580.62 = 305.98 : x
  2. Step 2: Convert to fraction form
    387.69/580.62 = 305.98/x
  3. Step 3: Cross multiply
    387.69x = 580.62 × 305.98
  4. Step 4: Simplify right side
    387.69x = 177,656.08
  5. Step 5: Solve for x
    x = 177,656.08/387.69
  6. Step 6: Final answer
    x = 458.25

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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.