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Finding the Fourth Proportional to 123,986.40, 185,979.60 and 86,661.60

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Solution

The fourth proportional to 123,986.40, 185,979.60 and 86,661.60 is: 129,992.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    123,986.40 : 185,979.60 = 86,661.60 : x
  2. Step 2: Convert to fraction form
    123,986.40/185,979.60 = 86,661.60/x
  3. Step 3: Cross multiply
    123,986.40x = 185,979.60 × 86,661.60
  4. Step 4: Simplify right side
    123,986.40x = 16,117,289,703.36
  5. Step 5: Solve for x
    x = 16,117,289,703.36/123,986.40
  6. Step 6: Final answer
    x = 129,992.40

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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.