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Finding the Fourth Proportional to 128,655.75, 177,323.27 and 85,558.20

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Solution

The fourth proportional to 128,655.75, 177,323.27 and 85,558.20 is: 117,922.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,655.75 : 177,323.27 = 85,558.20 : x
  2. Step 2: Convert to fraction form
    128,655.75/177,323.27 = 85,558.20/x
  3. Step 3: Cross multiply
    128,655.75x = 177,323.27 × 85,558.20
  4. Step 4: Simplify right side
    128,655.75x = 15,171,459,371.52
  5. Step 5: Solve for x
    x = 15,171,459,371.52/128,655.75
  6. Step 6: Final answer
    x = 117,922.90

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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.