Home / 85,681,615.08-128,520,927.83-20,985,980.65

Finding the Fourth Proportional to 85,681,615.08, 128,520,927.83 and 20,985,980.65

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Solution

The fourth proportional to 85,681,615.08, 128,520,927.83 and 20,985,980.65 is: 31,478,604.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,681,615.08 : 128,520,927.83 = 20,985,980.65 : x
  2. Step 2: Convert to fraction form
    85,681,615.08/128,520,927.83 = 20,985,980.65/x
  3. Step 3: Cross multiply
    85,681,615.08x = 128,520,927.83 × 20,985,980.65
  4. Step 4: Simplify right side
    85,681,615.08x = 2,697,137,704,291,589
  5. Step 5: Solve for x
    x = 2,697,137,704,291,589/85,681,615.08
  6. Step 6: Final answer
    x = 31,478,604.85

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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.