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Finding the Fourth Proportional to 18,165,378.95, 25,068,039.95 and 9,905,420.30

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Solution

The fourth proportional to 18,165,378.95, 25,068,039.95 and 9,905,420.30 is: 13,669,380.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,165,378.95 : 25,068,039.95 = 9,905,420.30 : x
  2. Step 2: Convert to fraction form
    18,165,378.95/25,068,039.95 = 9,905,420.30/x
  3. Step 3: Cross multiply
    18,165,378.95x = 25,068,039.95 × 9,905,420.30
  4. Step 4: Simplify right side
    18,165,378.95x = 248,309,471,627,073.69
  5. Step 5: Solve for x
    x = 248,309,471,627,073.69/18,165,378.95
  6. Step 6: Final answer
    x = 13,669,380.22

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.