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Finding the Fourth Proportional to 19,320, 28,980 and 4,728

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Solution

The fourth proportional to 19,320, 28,980 and 4,728 is: 7,092

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,320 : 28,980 = 4,728 : x
  2. Step 2: Convert to fraction form
    19,320/28,980 = 4,728/x
  3. Step 3: Cross multiply
    19,320x = 28,980 × 4,728
  4. Step 4: Simplify right side
    19,320x = 137,017,440
  5. Step 5: Solve for x
    x = 137,017,440/19,320
  6. Step 6: Final answer
    x = 7,092

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.