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Finding the Fourth Proportional to 85,512.30, 128,268.45 and 69,960.30

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Solution

The fourth proportional to 85,512.30, 128,268.45 and 69,960.30 is: 104,940.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,512.30 : 128,268.45 = 69,960.30 : x
  2. Step 2: Convert to fraction form
    85,512.30/128,268.45 = 69,960.30/x
  3. Step 3: Cross multiply
    85,512.30x = 128,268.45 × 69,960.30
  4. Step 4: Simplify right side
    85,512.30x = 8,973,699,242.54
  5. Step 5: Solve for x
    x = 8,973,699,242.54/85,512.30
  6. Step 6: Final answer
    x = 104,940.45

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Similar ratio
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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.