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Finding the Fourth Proportional to 129,458.28, 178,628.58 and 72,857.64

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Solution

The fourth proportional to 129,458.28, 178,628.58 and 72,857.64 is: 100,530.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,458.28 : 178,628.58 = 72,857.64 : x
  2. Step 2: Convert to fraction form
    129,458.28/178,628.58 = 72,857.64/x
  3. Step 3: Cross multiply
    129,458.28x = 178,628.58 × 72,857.64
  4. Step 4: Simplify right side
    129,458.28x = 13,014,456,775.35
  5. Step 5: Solve for x
    x = 13,014,456,775.35/129,458.28
  6. Step 6: Final answer
    x = 100,530.12

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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.