Home / 128,399.88-192,442.08-72,121.69

Finding the Fourth Proportional to 128,399.88, 192,442.08 and 72,121.69

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Solution

The fourth proportional to 128,399.88, 192,442.08 and 72,121.69 is: 108,093.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,399.88 : 192,442.08 = 72,121.69 : x
  2. Step 2: Convert to fraction form
    128,399.88/192,442.08 = 72,121.69/x
  3. Step 3: Cross multiply
    128,399.88x = 192,442.08 × 72,121.69
  4. Step 4: Simplify right side
    128,399.88x = 13,879,248,547.72
  5. Step 5: Solve for x
    x = 13,879,248,547.72/128,399.88
  6. Step 6: Final answer
    x = 108,093.93

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.