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Finding the Fourth Proportional to 128,986.94, 177,992.21 and 72,387.38

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Solution

The fourth proportional to 128,986.94, 177,992.21 and 72,387.38 is: 99,889.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,986.94 : 177,992.21 = 72,387.38 : x
  2. Step 2: Convert to fraction form
    128,986.94/177,992.21 = 72,387.38/x
  3. Step 3: Cross multiply
    128,986.94x = 177,992.21 × 72,387.38
  4. Step 4: Simplify right side
    128,986.94x = 12,884,388,490.41
  5. Step 5: Solve for x
    x = 12,884,388,490.41/128,986.94
  6. Step 6: Final answer
    x = 99,889.10

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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.