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Finding the Fourth Proportional to 346.95, 479.05 and 319.21

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Solution

The fourth proportional to 346.95, 479.05 and 319.21 is: 440.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    346.95 : 479.05 = 319.21 : x
  2. Step 2: Convert to fraction form
    346.95/479.05 = 319.21/x
  3. Step 3: Cross multiply
    346.95x = 479.05 × 319.21
  4. Step 4: Simplify right side
    346.95x = 152,915.55
  5. Step 5: Solve for x
    x = 152,915.55/346.95
  6. Step 6: Final answer
    x = 440.74

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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.