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Finding the Fourth Proportional to 91,100.60, 125,777.28 and 57,155.60

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Solution

The fourth proportional to 91,100.60, 125,777.28 and 57,155.60 is: 78,911.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,100.60 : 125,777.28 = 57,155.60 : x
  2. Step 2: Convert to fraction form
    91,100.60/125,777.28 = 57,155.60/x
  3. Step 3: Cross multiply
    91,100.60x = 125,777.28 × 57,155.60
  4. Step 4: Simplify right side
    91,100.60x = 7,188,875,904.77
  5. Step 5: Solve for x
    x = 7,188,875,904.77/91,100.60
  6. Step 6: Final answer
    x = 78,911.40

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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.