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Finding the Fourth Proportional to 100,908.74, 139,243.59 and 62,140.41

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Solution

The fourth proportional to 100,908.74, 139,243.59 and 62,140.41 is: 85,747.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,908.74 : 139,243.59 = 62,140.41 : x
  2. Step 2: Convert to fraction form
    100,908.74/139,243.59 = 62,140.41/x
  3. Step 3: Cross multiply
    100,908.74x = 139,243.59 × 62,140.41
  4. Step 4: Simplify right side
    100,908.74x = 8,652,653,772.47
  5. Step 5: Solve for x
    x = 8,652,653,772.47/100,908.74
  6. Step 6: Final answer
    x = 85,747.32

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.