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Finding the Fourth Proportional to 85,485.93, 128,150.78 and 38,076.09

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Solution

The fourth proportional to 85,485.93, 128,150.78 and 38,076.09 is: 57,079.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,485.93 : 128,150.78 = 38,076.09 : x
  2. Step 2: Convert to fraction form
    85,485.93/128,150.78 = 38,076.09/x
  3. Step 3: Cross multiply
    85,485.93x = 128,150.78 × 38,076.09
  4. Step 4: Simplify right side
    85,485.93x = 4,879,480,442.47
  5. Step 5: Solve for x
    x = 4,879,480,442.47/85,485.93
  6. Step 6: Final answer
    x = 57,079.34

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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.