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Finding the Fourth Proportional to 68,388, 102,587.76 and 19,140

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Solution

The fourth proportional to 68,388, 102,587.76 and 19,140 is: 28,711.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,388 : 102,587.76 = 19,140 : x
  2. Step 2: Convert to fraction form
    68,388/102,587.76 = 19,140/x
  3. Step 3: Cross multiply
    68,388x = 102,587.76 × 19,140
  4. Step 4: Simplify right side
    68,388x = 1,963,529,726.40
  5. Step 5: Solve for x
    x = 1,963,529,726.40/68,388
  6. Step 6: Final answer
    x = 28,711.61

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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.