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Finding the Fourth Proportional to 103,480.40, 155,220.60 and 71,987.60

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Solution

The fourth proportional to 103,480.40, 155,220.60 and 71,987.60 is: 107,981.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,480.40 : 155,220.60 = 71,987.60 : x
  2. Step 2: Convert to fraction form
    103,480.40/155,220.60 = 71,987.60/x
  3. Step 3: Cross multiply
    103,480.40x = 155,220.60 × 71,987.60
  4. Step 4: Simplify right side
    103,480.40x = 11,173,958,464.56
  5. Step 5: Solve for x
    x = 11,173,958,464.56/103,480.40
  6. Step 6: Final answer
    x = 107,981.40

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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.