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Finding the Fourth Proportional to 128,435.52, 177,258.88 and 71,850.72

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Solution

The fourth proportional to 128,435.52, 177,258.88 and 71,850.72 is: 99,163.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,435.52 : 177,258.88 = 71,850.72 : x
  2. Step 2: Convert to fraction form
    128,435.52/177,258.88 = 71,850.72/x
  3. Step 3: Cross multiply
    128,435.52x = 177,258.88 × 71,850.72
  4. Step 4: Simplify right side
    128,435.52x = 12,736,178,154.39
  5. Step 5: Solve for x
    x = 12,736,178,154.39/128,435.52
  6. Step 6: Final answer
    x = 99,163.99

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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.