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Finding the Fourth Proportional to 103,640.60, 155,460.90 and 72,147.80

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Solution

The fourth proportional to 103,640.60, 155,460.90 and 72,147.80 is: 108,221.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,640.60 : 155,460.90 = 72,147.80 : x
  2. Step 2: Convert to fraction form
    103,640.60/155,460.90 = 72,147.80/x
  3. Step 3: Cross multiply
    103,640.60x = 155,460.90 × 72,147.80
  4. Step 4: Simplify right side
    103,640.60x = 11,216,161,921.02
  5. Step 5: Solve for x
    x = 11,216,161,921.02/103,640.60
  6. Step 6: Final answer
    x = 108,221.70

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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.