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Finding the Fourth Proportional to 85,139.98, 127,720.56 and 28,975.77

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Solution

The fourth proportional to 85,139.98, 127,720.56 and 28,975.77 is: 43,467.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,139.98 : 127,720.56 = 28,975.77 : x
  2. Step 2: Convert to fraction form
    85,139.98/127,720.56 = 28,975.77/x
  3. Step 3: Cross multiply
    85,139.98x = 127,720.56 × 28,975.77
  4. Step 4: Simplify right side
    85,139.98x = 3,700,801,570.83
  5. Step 5: Solve for x
    x = 3,700,801,570.83/85,139.98
  6. Step 6: Final answer
    x = 43,467.26

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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.