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Finding the Fourth Proportional to 131,347.80, 197,021.70 and 78,816.60

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Solution

The fourth proportional to 131,347.80, 197,021.70 and 78,816.60 is: 118,224.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    131,347.80 : 197,021.70 = 78,816.60 : x
  2. Step 2: Convert to fraction form
    131,347.80/197,021.70 = 78,816.60/x
  3. Step 3: Cross multiply
    131,347.80x = 197,021.70 × 78,816.60
  4. Step 4: Simplify right side
    131,347.80x = 15,528,580,520.22
  5. Step 5: Solve for x
    x = 15,528,580,520.22/131,347.80
  6. Step 6: Final answer
    x = 118,224.90

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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.