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Finding the Fourth Proportional to 128,901, 193,343.73 and 76,643.04

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Solution

The fourth proportional to 128,901, 193,343.73 and 76,643.04 is: 114,959.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,901 : 193,343.73 = 76,643.04 : x
  2. Step 2: Convert to fraction form
    128,901/193,343.73 = 76,643.04/x
  3. Step 3: Cross multiply
    128,901x = 193,343.73 × 76,643.04
  4. Step 4: Simplify right side
    128,901x = 14,818,451,232.14
  5. Step 5: Solve for x
    x = 14,818,451,232.14/128,901
  6. Step 6: Final answer
    x = 114,959.94

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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.