Home / 129,403.05-178,571.83-72,803.49

Finding the Fourth Proportional to 129,403.05, 178,571.83 and 72,803.49

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Solution

The fourth proportional to 129,403.05, 178,571.83 and 72,803.49 is: 100,466.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,403.05 : 178,571.83 = 72,803.49 : x
  2. Step 2: Convert to fraction form
    129,403.05/178,571.83 = 72,803.49/x
  3. Step 3: Cross multiply
    129,403.05x = 178,571.83 × 72,803.49
  4. Step 4: Simplify right side
    129,403.05x = 13,000,652,439.69
  5. Step 5: Solve for x
    x = 13,000,652,439.69/129,403.05
  6. Step 6: Final answer
    x = 100,466.35

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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.