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Finding the Fourth Proportional to 86,628.80, 129,943.20 and 53,240.60

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Solution

The fourth proportional to 86,628.80, 129,943.20 and 53,240.60 is: 79,860.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,628.80 : 129,943.20 = 53,240.60 : x
  2. Step 2: Convert to fraction form
    86,628.80/129,943.20 = 53,240.60/x
  3. Step 3: Cross multiply
    86,628.80x = 129,943.20 × 53,240.60
  4. Step 4: Simplify right side
    86,628.80x = 6,918,253,933.92
  5. Step 5: Solve for x
    x = 6,918,253,933.92/86,628.80
  6. Step 6: Final answer
    x = 79,860.90

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.