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Finding the Fourth Proportional to 319.86, 441.45 and 188.91

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Solution

The fourth proportional to 319.86, 441.45 and 188.91 is: 260.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    319.86 : 441.45 = 188.91 : x
  2. Step 2: Convert to fraction form
    319.86/441.45 = 188.91/x
  3. Step 3: Cross multiply
    319.86x = 441.45 × 188.91
  4. Step 4: Simplify right side
    319.86x = 83,394.32
  5. Step 5: Solve for x
    x = 83,394.32/319.86
  6. Step 6: Final answer
    x = 260.72

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.