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Finding the Fourth Proportional to 81,402.40, 122,103.60 and 45,827.20

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Solution

The fourth proportional to 81,402.40, 122,103.60 and 45,827.20 is: 68,740.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,402.40 : 122,103.60 = 45,827.20 : x
  2. Step 2: Convert to fraction form
    81,402.40/122,103.60 = 45,827.20/x
  3. Step 3: Cross multiply
    81,402.40x = 122,103.60 × 45,827.20
  4. Step 4: Simplify right side
    81,402.40x = 5,595,666,097.92
  5. Step 5: Solve for x
    x = 5,595,666,097.92/81,402.40
  6. Step 6: Final answer
    x = 68,740.80

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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.