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Finding the Fourth Proportional to 66,688,789.86, 100,019,187.90 and 18,808,536.42

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Solution

The fourth proportional to 66,688,789.86, 100,019,187.90 and 18,808,536.42 is: 28,208,857.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,688,789.86 : 100,019,187.90 = 18,808,536.42 : x
  2. Step 2: Convert to fraction form
    66,688,789.86/100,019,187.90 = 18,808,536.42/x
  3. Step 3: Cross multiply
    66,688,789.86x = 100,019,187.90 × 18,808,536.42
  4. Step 4: Simplify right side
    66,688,789.86x = 1,881,214,538,315,973.50
  5. Step 5: Solve for x
    x = 1,881,214,538,315,973.50/66,688,789.86
  6. Step 6: Final answer
    x = 28,208,857.02

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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.