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Finding the Fourth Proportional to 100,880.70, 139,228.71 and 65,174.58

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Solution

The fourth proportional to 100,880.70, 139,228.71 and 65,174.58 is: 89,949.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,880.70 : 139,228.71 = 65,174.58 : x
  2. Step 2: Convert to fraction form
    100,880.70/139,228.71 = 65,174.58/x
  3. Step 3: Cross multiply
    100,880.70x = 139,228.71 × 65,174.58
  4. Step 4: Simplify right side
    100,880.70x = 9,074,172,698.19
  5. Step 5: Solve for x
    x = 9,074,172,698.19/100,880.70
  6. Step 6: Final answer
    x = 89,949.54

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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.