Home / 135,503.28-186,976.80-78,144.72

Finding the Fourth Proportional to 135,503.28, 186,976.80 and 78,144.72

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Solution

The fourth proportional to 135,503.28, 186,976.80 and 78,144.72 is: 107,829.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    135,503.28 : 186,976.80 = 78,144.72 : x
  2. Step 2: Convert to fraction form
    135,503.28/186,976.80 = 78,144.72/x
  3. Step 3: Cross multiply
    135,503.28x = 186,976.80 × 78,144.72
  4. Step 4: Simplify right side
    135,503.28x = 14,611,249,682.50
  5. Step 5: Solve for x
    x = 14,611,249,682.50/135,503.28
  6. Step 6: Final answer
    x = 107,829.49

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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.