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Finding the Fourth Proportional to 85,147.88, 127,729.38 and 25,989.80

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Solution

The fourth proportional to 85,147.88, 127,729.38 and 25,989.80 is: 38,987.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,147.88 : 127,729.38 = 25,989.80 : x
  2. Step 2: Convert to fraction form
    85,147.88/127,729.38 = 25,989.80/x
  3. Step 3: Cross multiply
    85,147.88x = 127,729.38 × 25,989.80
  4. Step 4: Simplify right side
    85,147.88x = 3,319,661,040.32
  5. Step 5: Solve for x
    x = 3,319,661,040.32/85,147.88
  6. Step 6: Final answer
    x = 38,987.01

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1.5x scale

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.