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Finding the Fourth Proportional to 18,978,917.50, 28,477,051.35 and 10,330,061.50

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Solution

The fourth proportional to 18,978,917.50, 28,477,051.35 and 10,330,061.50 is: 15,499,814.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,978,917.50 : 28,477,051.35 = 10,330,061.50 : x
  2. Step 2: Convert to fraction form
    18,978,917.50/28,477,051.35 = 10,330,061.50/x
  3. Step 3: Cross multiply
    18,978,917.50x = 28,477,051.35 × 10,330,061.50
  4. Step 4: Simplify right side
    18,978,917.50x = 294,169,691,784,158.06
  5. Step 5: Solve for x
    x = 294,169,691,784,158.06/18,978,917.50
  6. Step 6: Final answer
    x = 15,499,814.03

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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.