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Finding the Fourth Proportional to 80,703.40, 121,055.10 and 77,074.60

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Solution

The fourth proportional to 80,703.40, 121,055.10 and 77,074.60 is: 115,611.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,703.40 : 121,055.10 = 77,074.60 : x
  2. Step 2: Convert to fraction form
    80,703.40/121,055.10 = 77,074.60/x
  3. Step 3: Cross multiply
    80,703.40x = 121,055.10 × 77,074.60
  4. Step 4: Simplify right side
    80,703.40x = 9,330,273,410.46
  5. Step 5: Solve for x
    x = 9,330,273,410.46/80,703.40
  6. Step 6: Final answer
    x = 115,611.90

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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.