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Finding the Fourth Proportional to 309.36, 464.04 and 78.25

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Solution

The fourth proportional to 309.36, 464.04 and 78.25 is: 117.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.36 : 464.04 = 78.25 : x
  2. Step 2: Convert to fraction form
    309.36/464.04 = 78.25/x
  3. Step 3: Cross multiply
    309.36x = 464.04 × 78.25
  4. Step 4: Simplify right side
    309.36x = 36,311.13
  5. Step 5: Solve for x
    x = 36,311.13/309.36
  6. Step 6: Final answer
    x = 117.38

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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.