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Finding the Fourth Proportional to 78,771.52, 108,685.29 and 48,136.78

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Solution

The fourth proportional to 78,771.52, 108,685.29 and 48,136.78 is: 66,416.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,771.52 : 108,685.29 = 48,136.78 : x
  2. Step 2: Convert to fraction form
    78,771.52/108,685.29 = 48,136.78/x
  3. Step 3: Cross multiply
    78,771.52x = 108,685.29 × 48,136.78
  4. Step 4: Simplify right side
    78,771.52x = 5,231,759,893.97
  5. Step 5: Solve for x
    x = 5,231,759,893.97/78,771.52
  6. Step 6: Final answer
    x = 66,416.90

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.