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Finding the Fourth Proportional to 319.84, 440.16 and 283.12

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Solution

The fourth proportional to 319.84, 440.16 and 283.12 is: 389.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    319.84 : 440.16 = 283.12 : x
  2. Step 2: Convert to fraction form
    319.84/440.16 = 283.12/x
  3. Step 3: Cross multiply
    319.84x = 440.16 × 283.12
  4. Step 4: Simplify right side
    319.84x = 124,618.10
  5. Step 5: Solve for x
    x = 124,618.10/319.84
  6. Step 6: Final answer
    x = 389.63

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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.