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Finding the Fourth Proportional to 128,530.56, 177,337.32 and 78,193.92

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Solution

The fourth proportional to 128,530.56, 177,337.32 and 78,193.92 is: 107,886.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,530.56 : 177,337.32 = 78,193.92 : x
  2. Step 2: Convert to fraction form
    128,530.56/177,337.32 = 78,193.92/x
  3. Step 3: Cross multiply
    128,530.56x = 177,337.32 × 78,193.92
  4. Step 4: Simplify right side
    128,530.56x = 13,866,700,213.09
  5. Step 5: Solve for x
    x = 13,866,700,213.09/128,530.56
  6. Step 6: Final answer
    x = 107,886.41

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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.