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Finding the Fourth Proportional to 71,428.95, 107,147.79 and 18,838.38

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Solution

The fourth proportional to 71,428.95, 107,147.79 and 18,838.38 is: 28,258.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,428.95 : 107,147.79 = 18,838.38 : x
  2. Step 2: Convert to fraction form
    71,428.95/107,147.79 = 18,838.38/x
  3. Step 3: Cross multiply
    71,428.95x = 107,147.79 × 18,838.38
  4. Step 4: Simplify right side
    71,428.95x = 2,018,490,784.18
  5. Step 5: Solve for x
    x = 2,018,490,784.18/71,428.95
  6. Step 6: Final answer
    x = 28,258.72

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Why These Related Problems?

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