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Finding the Fourth Proportional to 85,698.80, 128,548.20 and 85,115.60

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Solution

The fourth proportional to 85,698.80, 128,548.20 and 85,115.60 is: 127,673.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,698.80 : 128,548.20 = 85,115.60 : x
  2. Step 2: Convert to fraction form
    85,698.80/128,548.20 = 85,115.60/x
  3. Step 3: Cross multiply
    85,698.80x = 128,548.20 × 85,115.60
  4. Step 4: Simplify right side
    85,698.80x = 10,941,457,171.92
  5. Step 5: Solve for x
    x = 10,941,457,171.92/85,698.80
  6. Step 6: Final answer
    x = 127,673.40

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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.