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Finding the Fourth Proportional to 85,847.80, 128,810.10 and 39,076.60

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Solution

The fourth proportional to 85,847.80, 128,810.10 and 39,076.60 is: 58,632.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,847.80 : 128,810.10 = 39,076.60 : x
  2. Step 2: Convert to fraction form
    85,847.80/128,810.10 = 39,076.60/x
  3. Step 3: Cross multiply
    85,847.80x = 128,810.10 × 39,076.60
  4. Step 4: Simplify right side
    85,847.80x = 5,033,460,753.66
  5. Step 5: Solve for x
    x = 5,033,460,753.66/85,847.80
  6. Step 6: Final answer
    x = 58,632.38

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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.