Home / 129,380.39-178,544.89-72,018.47

Finding the Fourth Proportional to 129,380.39, 178,544.89 and 72,018.47

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Solution

The fourth proportional to 129,380.39, 178,544.89 and 72,018.47 is: 99,385.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,380.39 : 178,544.89 = 72,018.47 : x
  2. Step 2: Convert to fraction form
    129,380.39/178,544.89 = 72,018.47/x
  3. Step 3: Cross multiply
    129,380.39x = 178,544.89 × 72,018.47
  4. Step 4: Simplify right side
    129,380.39x = 12,858,529,804.12
  5. Step 5: Solve for x
    x = 12,858,529,804.12/129,380.39
  6. Step 6: Final answer
    x = 99,385.46

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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.