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Finding the Fourth Proportional to 85,979.20, 128,968.80 and 71,204.80

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Solution

The fourth proportional to 85,979.20, 128,968.80 and 71,204.80 is: 106,807.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,979.20 : 128,968.80 = 71,204.80 : x
  2. Step 2: Convert to fraction form
    85,979.20/128,968.80 = 71,204.80/x
  3. Step 3: Cross multiply
    85,979.20x = 128,968.80 × 71,204.80
  4. Step 4: Simplify right side
    85,979.20x = 9,183,197,610.24
  5. Step 5: Solve for x
    x = 9,183,197,610.24/85,979.20
  6. Step 6: Final answer
    x = 106,807.20

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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.