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Finding the Fourth Proportional to 339.93, 509.56 and 157.21

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Solution

The fourth proportional to 339.93, 509.56 and 157.21 is: 235.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    339.93 : 509.56 = 157.21 : x
  2. Step 2: Convert to fraction form
    339.93/509.56 = 157.21/x
  3. Step 3: Cross multiply
    339.93x = 509.56 × 157.21
  4. Step 4: Simplify right side
    339.93x = 80,106.26
  5. Step 5: Solve for x
    x = 80,106.26/339.93
  6. Step 6: Final answer
    x = 235.66

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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.