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Finding the Fourth Proportional to 139,969,219.20, 209,953,828.80 and 86,146,857.60

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Solution

The fourth proportional to 139,969,219.20, 209,953,828.80 and 86,146,857.60 is: 129,220,286.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,969,219.20 : 209,953,828.80 = 86,146,857.60 : x
  2. Step 2: Convert to fraction form
    139,969,219.20/209,953,828.80 = 86,146,857.60/x
  3. Step 3: Cross multiply
    139,969,219.20x = 209,953,828.80 × 86,146,857.60
  4. Step 4: Simplify right side
    139,969,219.20x = 18,086,862,592,208,380
  5. Step 5: Solve for x
    x = 18,086,862,592,208,380/139,969,219.20
  6. Step 6: Final answer
    x = 129,220,286.40

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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.