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Finding the Fourth Proportional to 86,889,920.80, 130,222,906.80 and 66,594,560.80

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Solution

The fourth proportional to 86,889,920.80, 130,222,906.80 and 66,594,560.80 is: 99,806,021.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,889,920.80 : 130,222,906.80 = 66,594,560.80 : x
  2. Step 2: Convert to fraction form
    86,889,920.80/130,222,906.80 = 66,594,560.80/x
  3. Step 3: Cross multiply
    86,889,920.80x = 130,222,906.80 × 66,594,560.80
  4. Step 4: Simplify right side
    86,889,920.80x = 8,672,137,284,445,333
  5. Step 5: Solve for x
    x = 8,672,137,284,445,333/86,889,920.80
  6. Step 6: Final answer
    x = 99,806,021.28

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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.