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Finding the Fourth Proportional to 135,369.54, 186,840 and 78,813.72

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Solution

The fourth proportional to 135,369.54, 186,840 and 78,813.72 is: 108,780.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    135,369.54 : 186,840 = 78,813.72 : x
  2. Step 2: Convert to fraction form
    135,369.54/186,840 = 78,813.72/x
  3. Step 3: Cross multiply
    135,369.54x = 186,840 × 78,813.72
  4. Step 4: Simplify right side
    135,369.54x = 14,725,555,444.80
  5. Step 5: Solve for x
    x = 14,725,555,444.80/135,369.54
  6. Step 6: Final answer
    x = 108,780.42

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1.5x scale

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.