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Finding the Fourth Proportional to 76,987.20, 115,480.80 and 72,321.60

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Solution

The fourth proportional to 76,987.20, 115,480.80 and 72,321.60 is: 108,482.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    76,987.20 : 115,480.80 = 72,321.60 : x
  2. Step 2: Convert to fraction form
    76,987.20/115,480.80 = 72,321.60/x
  3. Step 3: Cross multiply
    76,987.20x = 115,480.80 × 72,321.60
  4. Step 4: Simplify right side
    76,987.20x = 8,351,756,225.28
  5. Step 5: Solve for x
    x = 8,351,756,225.28/76,987.20
  6. Step 6: Final answer
    x = 108,482.40

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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.