Home / 129,318.36-178,457.58-72,729.72

Finding the Fourth Proportional to 129,318.36, 178,457.58 and 72,729.72

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Solution

The fourth proportional to 129,318.36, 178,457.58 and 72,729.72 is: 100,366.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,318.36 : 178,457.58 = 72,729.72 : x
  2. Step 2: Convert to fraction form
    129,318.36/178,457.58 = 72,729.72/x
  3. Step 3: Cross multiply
    129,318.36x = 178,457.58 × 72,729.72
  4. Step 4: Simplify right side
    129,318.36x = 12,979,169,825.28
  5. Step 5: Solve for x
    x = 12,979,169,825.28/129,318.36
  6. Step 6: Final answer
    x = 100,366.03

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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.