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Finding the Fourth Proportional to 71,424.72, 107,128.44 and 18,838.17

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Solution

The fourth proportional to 71,424.72, 107,128.44 and 18,838.17 is: 28,254.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,424.72 : 107,128.44 = 18,838.17 : x
  2. Step 2: Convert to fraction form
    71,424.72/107,128.44 = 18,838.17/x
  3. Step 3: Cross multiply
    71,424.72x = 107,128.44 × 18,838.17
  4. Step 4: Simplify right side
    71,424.72x = 2,018,103,764.55
  5. Step 5: Solve for x
    x = 2,018,103,764.55/71,424.72
  6. Step 6: Final answer
    x = 28,254.98

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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.