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Finding the Fourth Proportional to 128,897.52, 193,338.48 and 76,639.56

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Solution

The fourth proportional to 128,897.52, 193,338.48 and 76,639.56 is: 114,954.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,897.52 : 193,338.48 = 76,639.56 : x
  2. Step 2: Convert to fraction form
    128,897.52/193,338.48 = 76,639.56/x
  3. Step 3: Cross multiply
    128,897.52x = 193,338.48 × 76,639.56
  4. Step 4: Simplify right side
    128,897.52x = 14,817,376,038.27
  5. Step 5: Solve for x
    x = 14,817,376,038.27/128,897.52
  6. Step 6: Final answer
    x = 114,954.70

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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.