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Finding the Fourth Proportional to 310.09, 465.15 and 78.98

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Solution

The fourth proportional to 310.09, 465.15 and 78.98 is: 118.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    310.09 : 465.15 = 78.98 : x
  2. Step 2: Convert to fraction form
    310.09/465.15 = 78.98/x
  3. Step 3: Cross multiply
    310.09x = 465.15 × 78.98
  4. Step 4: Simplify right side
    310.09x = 36,737.15
  5. Step 5: Solve for x
    x = 36,737.15/310.09
  6. Step 6: Final answer
    x = 118.47

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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.