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Finding the Fourth Proportional to 128,330.94, 177,097.21 and 71,742.32

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Solution

The fourth proportional to 128,330.94, 177,097.21 and 71,742.32 is: 99,004.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,330.94 : 177,097.21 = 71,742.32 : x
  2. Step 2: Convert to fraction form
    128,330.94/177,097.21 = 71,742.32/x
  3. Step 3: Cross multiply
    128,330.94x = 177,097.21 × 71,742.32
  4. Step 4: Simplify right side
    128,330.94x = 12,705,363,646.09
  5. Step 5: Solve for x
    x = 12,705,363,646.09/128,330.94
  6. Step 6: Final answer
    x = 99,004.68

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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.