Home / 129,286.64-178,372.68-105,372.20

Finding the Fourth Proportional to 129,286.64, 178,372.68 and 105,372.20

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Solution

The fourth proportional to 129,286.64, 178,372.68 and 105,372.20 is: 145,378.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,286.64 : 178,372.68 = 105,372.20 : x
  2. Step 2: Convert to fraction form
    129,286.64/178,372.68 = 105,372.20/x
  3. Step 3: Cross multiply
    129,286.64x = 178,372.68 × 105,372.20
  4. Step 4: Simplify right side
    129,286.64x = 18,795,521,711.50
  5. Step 5: Solve for x
    x = 18,795,521,711.50/129,286.64
  6. Step 6: Final answer
    x = 145,378.69

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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.