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Finding the Fourth Proportional to 128,958.01, 177,962.15 and 72,369.38

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Solution

The fourth proportional to 128,958.01, 177,962.15 and 72,369.38 is: 99,869.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,958.01 : 177,962.15 = 72,369.38 : x
  2. Step 2: Convert to fraction form
    128,958.01/177,962.15 = 72,369.38/x
  3. Step 3: Cross multiply
    128,958.01x = 177,962.15 × 72,369.38
  4. Step 4: Simplify right side
    128,958.01x = 12,879,010,458.97
  5. Step 5: Solve for x
    x = 12,879,010,458.97/128,958.01
  6. Step 6: Final answer
    x = 99,869.80

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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.