Home / 86,344.40-129,478.20-39,611.60

Finding the Fourth Proportional to 86,344.40, 129,478.20 and 39,611.60

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Solution

The fourth proportional to 86,344.40, 129,478.20 and 39,611.60 is: 59,399.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,344.40 : 129,478.20 = 39,611.60 : x
  2. Step 2: Convert to fraction form
    86,344.40/129,478.20 = 39,611.60/x
  3. Step 3: Cross multiply
    86,344.40x = 129,478.20 × 39,611.60
  4. Step 4: Simplify right side
    86,344.40x = 5,128,838,667.12
  5. Step 5: Solve for x
    x = 5,128,838,667.12/86,344.40
  6. Step 6: Final answer
    x = 59,399.78

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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.