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Finding the Fourth Proportional to 128,775.64, 177,721.34 and 72,197.92

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Solution

The fourth proportional to 128,775.64, 177,721.34 and 72,197.92 is: 99,639.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,775.64 : 177,721.34 = 72,197.92 : x
  2. Step 2: Convert to fraction form
    128,775.64/177,721.34 = 72,197.92/x
  3. Step 3: Cross multiply
    128,775.64x = 177,721.34 × 72,197.92
  4. Step 4: Simplify right side
    128,775.64x = 12,831,111,087.61
  5. Step 5: Solve for x
    x = 12,831,111,087.61/128,775.64
  6. Step 6: Final answer
    x = 99,639.27

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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.