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Finding the Fourth Proportional to 76,808.40, 115,018.20 and 56,979.60

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Solution

The fourth proportional to 76,808.40, 115,018.20 and 56,979.60 is: 85,325.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    76,808.40 : 115,018.20 = 56,979.60 : x
  2. Step 2: Convert to fraction form
    76,808.40/115,018.20 = 56,979.60/x
  3. Step 3: Cross multiply
    76,808.40x = 115,018.20 × 56,979.60
  4. Step 4: Simplify right side
    76,808.40x = 6,553,691,028.72
  5. Step 5: Solve for x
    x = 6,553,691,028.72/76,808.40
  6. Step 6: Final answer
    x = 85,325.19

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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.