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Finding the Fourth Proportional to 319.68, 479.52 and 259.20

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Solution

The fourth proportional to 319.68, 479.52 and 259.20 is: 388.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    319.68 : 479.52 = 259.20 : x
  2. Step 2: Convert to fraction form
    319.68/479.52 = 259.20/x
  3. Step 3: Cross multiply
    319.68x = 479.52 × 259.20
  4. Step 4: Simplify right side
    319.68x = 124,291.58
  5. Step 5: Solve for x
    x = 124,291.58/319.68
  6. Step 6: Final answer
    x = 388.80

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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.