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Finding the Fourth Proportional to 85,979.10, 128,980.80 and 26,808.60

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Solution

The fourth proportional to 85,979.10, 128,980.80 and 26,808.60 is: 40,216.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,979.10 : 128,980.80 = 26,808.60 : x
  2. Step 2: Convert to fraction form
    85,979.10/128,980.80 = 26,808.60/x
  3. Step 3: Cross multiply
    85,979.10x = 128,980.80 × 26,808.60
  4. Step 4: Simplify right side
    85,979.10x = 3,457,794,674.88
  5. Step 5: Solve for x
    x = 3,457,794,674.88/85,979.10
  6. Step 6: Final answer
    x = 40,216.69

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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.