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Finding the Fourth Proportional to 128,621, 177,497.02 and 72,032.38

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Solution

The fourth proportional to 128,621, 177,497.02 and 72,032.38 is: 99,404.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,621 : 177,497.02 = 72,032.38 : x
  2. Step 2: Convert to fraction form
    128,621/177,497.02 = 72,032.38/x
  3. Step 3: Cross multiply
    128,621x = 177,497.02 × 72,032.38
  4. Step 4: Simplify right side
    128,621x = 12,785,532,793.51
  5. Step 5: Solve for x
    x = 12,785,532,793.51/128,621
  6. Step 6: Final answer
    x = 99,404.71

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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.