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Finding the Fourth Proportional to 78,487.80, 117,731.70 and 53,604.60

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Solution

The fourth proportional to 78,487.80, 117,731.70 and 53,604.60 is: 80,406.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,487.80 : 117,731.70 = 53,604.60 : x
  2. Step 2: Convert to fraction form
    78,487.80/117,731.70 = 53,604.60/x
  3. Step 3: Cross multiply
    78,487.80x = 117,731.70 × 53,604.60
  4. Step 4: Simplify right side
    78,487.80x = 6,310,960,685.82
  5. Step 5: Solve for x
    x = 6,310,960,685.82/78,487.80
  6. Step 6: Final answer
    x = 80,406.90

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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.