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Finding the Fourth Proportional to 78,699.80, 118,049.70 and 72,284.60

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Solution

The fourth proportional to 78,699.80, 118,049.70 and 72,284.60 is: 108,426.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,699.80 : 118,049.70 = 72,284.60 : x
  2. Step 2: Convert to fraction form
    78,699.80/118,049.70 = 72,284.60/x
  3. Step 3: Cross multiply
    78,699.80x = 118,049.70 × 72,284.60
  4. Step 4: Simplify right side
    78,699.80x = 8,533,175,344.62
  5. Step 5: Solve for x
    x = 8,533,175,344.62/78,699.80
  6. Step 6: Final answer
    x = 108,426.90

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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.