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Finding the Fourth Proportional to 139,968.20, 209,952.30 and 86,702.60

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Solution

The fourth proportional to 139,968.20, 209,952.30 and 86,702.60 is: 130,053.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,968.20 : 209,952.30 = 86,702.60 : x
  2. Step 2: Convert to fraction form
    139,968.20/209,952.30 = 86,702.60/x
  3. Step 3: Cross multiply
    139,968.20x = 209,952.30 × 86,702.60
  4. Step 4: Simplify right side
    139,968.20x = 18,203,410,285.98
  5. Step 5: Solve for x
    x = 18,203,410,285.98/139,968.20
  6. Step 6: Final answer
    x = 130,053.90

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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.