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Finding the Fourth Proportional to 128,700.32, 177,589.64 and 72,122

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Solution

The fourth proportional to 128,700.32, 177,589.64 and 72,122 is: 99,518.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,700.32 : 177,589.64 = 72,122 : x
  2. Step 2: Convert to fraction form
    128,700.32/177,589.64 = 72,122/x
  3. Step 3: Cross multiply
    128,700.32x = 177,589.64 × 72,122
  4. Step 4: Simplify right side
    128,700.32x = 12,808,120,016.08
  5. Step 5: Solve for x
    x = 12,808,120,016.08/128,700.32
  6. Step 6: Final answer
    x = 99,518.94

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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.