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Finding the Fourth Proportional to 319.76, 479.64 and 206.48

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Solution

The fourth proportional to 319.76, 479.64 and 206.48 is: 309.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    319.76 : 479.64 = 206.48 : x
  2. Step 2: Convert to fraction form
    319.76/479.64 = 206.48/x
  3. Step 3: Cross multiply
    319.76x = 479.64 × 206.48
  4. Step 4: Simplify right side
    319.76x = 99,036.07
  5. Step 5: Solve for x
    x = 99,036.07/319.76
  6. Step 6: Final answer
    x = 309.72

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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.