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Finding the Fourth Proportional to 85,889.38, 128,853.30 and 25,918.90

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Solution

The fourth proportional to 85,889.38, 128,853.30 and 25,918.90 is: 38,884.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,889.38 : 128,853.30 = 25,918.90 : x
  2. Step 2: Convert to fraction form
    85,889.38/128,853.30 = 25,918.90/x
  3. Step 3: Cross multiply
    85,889.38x = 128,853.30 × 25,918.90
  4. Step 4: Simplify right side
    85,889.38x = 3,339,735,417.66
  5. Step 5: Solve for x
    x = 3,339,735,417.66/85,889.38
  6. Step 6: Final answer
    x = 38,884.15

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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.