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Finding the Fourth Proportional to 66,885,563.20, 100,421,656.80 and 42,773,742.40

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Solution

The fourth proportional to 66,885,563.20, 100,421,656.80 and 42,773,742.40 is: 64,220,287.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,885,563.20 : 100,421,656.80 = 42,773,742.40 : x
  2. Step 2: Convert to fraction form
    66,885,563.20/100,421,656.80 = 42,773,742.40/x
  3. Step 3: Cross multiply
    66,885,563.20x = 100,421,656.80 × 42,773,742.40
  4. Step 4: Simplify right side
    66,885,563.20x = 4,295,410,079,344,408
  5. Step 5: Solve for x
    x = 4,295,410,079,344,408/66,885,563.20
  6. Step 6: Final answer
    x = 64,220,287.22

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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.