Home / 80,639.85-121,043.80-78,830.62

Finding the Fourth Proportional to 80,639.85, 121,043.80 and 78,830.62

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Solution

The fourth proportional to 80,639.85, 121,043.80 and 78,830.62 is: 118,328.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,639.85 : 121,043.80 = 78,830.62 : x
  2. Step 2: Convert to fraction form
    80,639.85/121,043.80 = 78,830.62/x
  3. Step 3: Cross multiply
    80,639.85x = 121,043.80 × 78,830.62
  4. Step 4: Simplify right side
    80,639.85x = 9,541,957,597.08
  5. Step 5: Solve for x
    x = 9,541,957,597.08/80,639.85
  6. Step 6: Final answer
    x = 118,328.06

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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.