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Finding the Fourth Proportional to 136,553.52, 188,444.64 and 76,128

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Solution

The fourth proportional to 136,553.52, 188,444.64 and 76,128 is: 105,057.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    136,553.52 : 188,444.64 = 76,128 : x
  2. Step 2: Convert to fraction form
    136,553.52/188,444.64 = 76,128/x
  3. Step 3: Cross multiply
    136,553.52x = 188,444.64 × 76,128
  4. Step 4: Simplify right side
    136,553.52x = 14,345,913,553.92
  5. Step 5: Solve for x
    x = 14,345,913,553.92/136,553.52
  6. Step 6: Final answer
    x = 105,057.08

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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.