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Finding the Fourth Proportional to 139,801.70, 209,702.55 and 69,817.70

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Solution

The fourth proportional to 139,801.70, 209,702.55 and 69,817.70 is: 104,726.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,801.70 : 209,702.55 = 69,817.70 : x
  2. Step 2: Convert to fraction form
    139,801.70/209,702.55 = 69,817.70/x
  3. Step 3: Cross multiply
    139,801.70x = 209,702.55 × 69,817.70
  4. Step 4: Simplify right side
    139,801.70x = 14,640,949,725.14
  5. Step 5: Solve for x
    x = 14,640,949,725.14/139,801.70
  6. Step 6: Final answer
    x = 104,726.55

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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.