Home / 85,431,498.72-128,145,890.64-20,735,839.20

Finding the Fourth Proportional to 85,431,498.72, 128,145,890.64 and 20,735,839.20

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Solution

The fourth proportional to 85,431,498.72, 128,145,890.64 and 20,735,839.20 is: 31,103,429.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,431,498.72 : 128,145,890.64 = 20,735,839.20 : x
  2. Step 2: Convert to fraction form
    85,431,498.72/128,145,890.64 = 20,735,839.20/x
  3. Step 3: Cross multiply
    85,431,498.72x = 128,145,890.64 × 20,735,839.20
  4. Step 4: Simplify right side
    85,431,498.72x = 2,657,212,582,451,825
  5. Step 5: Solve for x
    x = 2,657,212,582,451,825/85,431,498.72
  6. Step 6: Final answer
    x = 31,103,429.32

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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.