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Finding the Fourth Proportional to 128,952.42, 193,178.34 and 72,620.70

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Solution

The fourth proportional to 128,952.42, 193,178.34 and 72,620.70 is: 108,790.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,952.42 : 193,178.34 = 72,620.70 : x
  2. Step 2: Convert to fraction form
    128,952.42/193,178.34 = 72,620.70/x
  3. Step 3: Cross multiply
    128,952.42x = 193,178.34 × 72,620.70
  4. Step 4: Simplify right side
    128,952.42x = 14,028,746,275.64
  5. Step 5: Solve for x
    x = 14,028,746,275.64/128,952.42
  6. Step 6: Final answer
    x = 108,790.10

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.