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Finding the Fourth Proportional to 339.93, 509.39 and 305.51

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Solution

The fourth proportional to 339.93, 509.39 and 305.51 is: 457.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    339.93 : 509.39 = 305.51 : x
  2. Step 2: Convert to fraction form
    339.93/509.39 = 305.51/x
  3. Step 3: Cross multiply
    339.93x = 509.39 × 305.51
  4. Step 4: Simplify right side
    339.93x = 155,620.81
  5. Step 5: Solve for x
    x = 155,620.81/339.93
  6. Step 6: Final answer
    x = 457.80

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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.