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Finding the Fourth Proportional to 81,421.60, 122,132.40 and 60,426.40

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Solution

The fourth proportional to 81,421.60, 122,132.40 and 60,426.40 is: 90,639.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,421.60 : 122,132.40 = 60,426.40 : x
  2. Step 2: Convert to fraction form
    81,421.60/122,132.40 = 60,426.40/x
  3. Step 3: Cross multiply
    81,421.60x = 122,132.40 × 60,426.40
  4. Step 4: Simplify right side
    81,421.60x = 7,380,021,255.36
  5. Step 5: Solve for x
    x = 7,380,021,255.36/81,421.60
  6. Step 6: Final answer
    x = 90,639.60

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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.