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Finding the Fourth Proportional to 128,925.81, 177,914.81 and 71,561.76

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Solution

The fourth proportional to 128,925.81, 177,914.81 and 71,561.76 is: 98,753.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,925.81 : 177,914.81 = 71,561.76 : x
  2. Step 2: Convert to fraction form
    128,925.81/177,914.81 = 71,561.76/x
  3. Step 3: Cross multiply
    128,925.81x = 177,914.81 × 71,561.76
  4. Step 4: Simplify right side
    128,925.81x = 12,731,896,575.86
  5. Step 5: Solve for x
    x = 12,731,896,575.86/128,925.81
  6. Step 6: Final answer
    x = 98,753.67

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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.