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Finding the Fourth Proportional to 348.58, 520.30 and 319.72

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Solution

The fourth proportional to 348.58, 520.30 and 319.72 is: 477.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    348.58 : 520.30 = 319.72 : x
  2. Step 2: Convert to fraction form
    348.58/520.30 = 319.72/x
  3. Step 3: Cross multiply
    348.58x = 520.30 × 319.72
  4. Step 4: Simplify right side
    348.58x = 166,350.32
  5. Step 5: Solve for x
    x = 166,350.32/348.58
  6. Step 6: Final answer
    x = 477.22

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.