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Finding the Fourth Proportional to 81,261,978.60, 121,907,730.15 and 26,659,368.30

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Solution

The fourth proportional to 81,261,978.60, 121,907,730.15 and 26,659,368.30 is: 39,993,895.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,261,978.60 : 121,907,730.15 = 26,659,368.30 : x
  2. Step 2: Convert to fraction form
    81,261,978.60/121,907,730.15 = 26,659,368.30/x
  3. Step 3: Cross multiply
    81,261,978.60x = 121,907,730.15 × 26,659,368.30
  4. Step 4: Simplify right side
    81,261,978.60x = 3,249,983,076,685,864.50
  5. Step 5: Solve for x
    x = 3,249,983,076,685,864.50/81,261,978.60
  6. Step 6: Final answer
    x = 39,993,895.46

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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.