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Finding the Fourth Proportional to 128,857.42, 177,822.70 and 72,268.80

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Solution

The fourth proportional to 128,857.42, 177,822.70 and 72,268.80 is: 99,730.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,857.42 : 177,822.70 = 72,268.80 : x
  2. Step 2: Convert to fraction form
    128,857.42/177,822.70 = 72,268.80/x
  3. Step 3: Cross multiply
    128,857.42x = 177,822.70 × 72,268.80
  4. Step 4: Simplify right side
    128,857.42x = 12,851,033,141.76
  5. Step 5: Solve for x
    x = 12,851,033,141.76/128,857.42
  6. Step 6: Final answer
    x = 99,730.64

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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.