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Finding the Fourth Proportional to 319.19, 440.80 and 284.83

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Solution

The fourth proportional to 319.19, 440.80 and 284.83 is: 393.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    319.19 : 440.80 = 284.83 : x
  2. Step 2: Convert to fraction form
    319.19/440.80 = 284.83/x
  3. Step 3: Cross multiply
    319.19x = 440.80 × 284.83
  4. Step 4: Simplify right side
    319.19x = 125,551.25
  5. Step 5: Solve for x
    x = 125,551.25/319.19
  6. Step 6: Final answer
    x = 393.35

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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.