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Finding the Fourth Proportional to 136,978.15, 189,029.30 and 76,548.77

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Solution

The fourth proportional to 136,978.15, 189,029.30 and 76,548.77 is: 105,637.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    136,978.15 : 189,029.30 = 76,548.77 : x
  2. Step 2: Convert to fraction form
    136,978.15/189,029.30 = 76,548.77/x
  3. Step 3: Cross multiply
    136,978.15x = 189,029.30 × 76,548.77
  4. Step 4: Simplify right side
    136,978.15x = 14,469,960,408.96
  5. Step 5: Solve for x
    x = 14,469,960,408.96/136,978.15
  6. Step 6: Final answer
    x = 105,637.00

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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.