Home / 129,509.56-178,720.49-72,148.80

Finding the Fourth Proportional to 129,509.56, 178,720.49 and 72,148.80

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Solution

The fourth proportional to 129,509.56, 178,720.49 and 72,148.80 is: 99,563.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,509.56 : 178,720.49 = 72,148.80 : x
  2. Step 2: Convert to fraction form
    129,509.56/178,720.49 = 72,148.80/x
  3. Step 3: Cross multiply
    129,509.56x = 178,720.49 × 72,148.80
  4. Step 4: Simplify right side
    129,509.56x = 12,894,469,069.28
  5. Step 5: Solve for x
    x = 12,894,469,069.28/129,509.56
  6. Step 6: Final answer
    x = 99,563.84

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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.