Home / 128,772.32-177,705.23-72,183.69

Finding the Fourth Proportional to 128,772.32, 177,705.23 and 72,183.69

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Solution

The fourth proportional to 128,772.32, 177,705.23 and 72,183.69 is: 99,613.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,772.32 : 177,705.23 = 72,183.69 : x
  2. Step 2: Convert to fraction form
    128,772.32/177,705.23 = 72,183.69/x
  3. Step 3: Cross multiply
    128,772.32x = 177,705.23 × 72,183.69
  4. Step 4: Simplify right side
    128,772.32x = 12,827,418,872.78
  5. Step 5: Solve for x
    x = 12,827,418,872.78/128,772.32
  6. Step 6: Final answer
    x = 99,613.17

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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.