Home / 86,421.60-129,632.40-81,172.80

Finding the Fourth Proportional to 86,421.60, 129,632.40 and 81,172.80

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Solution

The fourth proportional to 86,421.60, 129,632.40 and 81,172.80 is: 121,759.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,421.60 : 129,632.40 = 81,172.80 : x
  2. Step 2: Convert to fraction form
    86,421.60/129,632.40 = 81,172.80/x
  3. Step 3: Cross multiply
    86,421.60x = 129,632.40 × 81,172.80
  4. Step 4: Simplify right side
    86,421.60x = 10,522,624,878.72
  5. Step 5: Solve for x
    x = 10,522,624,878.72/86,421.60
  6. Step 6: Final answer
    x = 121,759.20

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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.