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Finding the Fourth Proportional to 80,989.96, 121,485.76 and 28,400.72

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Solution

The fourth proportional to 80,989.96, 121,485.76 and 28,400.72 is: 42,601.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,989.96 : 121,485.76 = 28,400.72 : x
  2. Step 2: Convert to fraction form
    80,989.96/121,485.76 = 28,400.72/x
  3. Step 3: Cross multiply
    80,989.96x = 121,485.76 × 28,400.72
  4. Step 4: Simplify right side
    80,989.96x = 3,450,283,053.75
  5. Step 5: Solve for x
    x = 3,450,283,053.75/80,989.96
  6. Step 6: Final answer
    x = 42,601.37

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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.