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Finding the Fourth Proportional to 85,428.47, 128,119.24 and 25,454.25

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Solution

The fourth proportional to 85,428.47, 128,119.24 and 25,454.25 is: 38,174.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,428.47 : 128,119.24 = 25,454.25 : x
  2. Step 2: Convert to fraction form
    85,428.47/128,119.24 = 25,454.25/x
  3. Step 3: Cross multiply
    85,428.47x = 128,119.24 × 25,454.25
  4. Step 4: Simplify right side
    85,428.47x = 3,261,179,164.77
  5. Step 5: Solve for x
    x = 3,261,179,164.77/85,428.47
  6. Step 6: Final answer
    x = 38,174.38

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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.