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Finding the Fourth Proportional to 128,857.56, 177,823.26 and 72,268.44

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Solution

The fourth proportional to 128,857.56, 177,823.26 and 72,268.44 is: 99,730.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,857.56 : 177,823.26 = 72,268.44 : x
  2. Step 2: Convert to fraction form
    128,857.56/177,823.26 = 72,268.44/x
  3. Step 3: Cross multiply
    128,857.56x = 177,823.26 × 72,268.44
  4. Step 4: Simplify right side
    128,857.56x = 12,851,009,595.91
  5. Step 5: Solve for x
    x = 12,851,009,595.91/128,857.56
  6. Step 6: Final answer
    x = 99,730.35

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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.