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Finding the Fourth Proportional to 81,992.40, 122,988.60 and 55,748.40

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Solution

The fourth proportional to 81,992.40, 122,988.60 and 55,748.40 is: 83,622.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,992.40 : 122,988.60 = 55,748.40 : x
  2. Step 2: Convert to fraction form
    81,992.40/122,988.60 = 55,748.40/x
  3. Step 3: Cross multiply
    81,992.40x = 122,988.60 × 55,748.40
  4. Step 4: Simplify right side
    81,992.40x = 6,856,417,668.24
  5. Step 5: Solve for x
    x = 6,856,417,668.24/81,992.40
  6. Step 6: Final answer
    x = 83,622.60

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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.