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Finding the Fourth Proportional to 85,838.80, 128,796.60 and 39,067.60

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Solution

The fourth proportional to 85,838.80, 128,796.60 and 39,067.60 is: 58,618.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,838.80 : 128,796.60 = 39,067.60 : x
  2. Step 2: Convert to fraction form
    85,838.80/128,796.60 = 39,067.60/x
  3. Step 3: Cross multiply
    85,838.80x = 128,796.60 × 39,067.60
  4. Step 4: Simplify right side
    85,838.80x = 5,031,774,050.16
  5. Step 5: Solve for x
    x = 5,031,774,050.16/85,838.80
  6. Step 6: Final answer
    x = 58,618.88

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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.