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Finding the Fourth Proportional to 135,600, 187,128 and 79,011.36

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Solution

The fourth proportional to 135,600, 187,128 and 79,011.36 is: 109,035.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    135,600 : 187,128 = 79,011.36 : x
  2. Step 2: Convert to fraction form
    135,600/187,128 = 79,011.36/x
  3. Step 3: Cross multiply
    135,600x = 187,128 × 79,011.36
  4. Step 4: Simplify right side
    135,600x = 14,785,237,774.08
  5. Step 5: Solve for x
    x = 14,785,237,774.08/135,600
  6. Step 6: Final answer
    x = 109,035.68

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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.