Home / 81,322.80-121,984.20-56,439.60

Finding the Fourth Proportional to 81,322.80, 121,984.20 and 56,439.60

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Solution

The fourth proportional to 81,322.80, 121,984.20 and 56,439.60 is: 84,659.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,322.80 : 121,984.20 = 56,439.60 : x
  2. Step 2: Convert to fraction form
    81,322.80/121,984.20 = 56,439.60/x
  3. Step 3: Cross multiply
    81,322.80x = 121,984.20 × 56,439.60
  4. Step 4: Simplify right side
    81,322.80x = 6,884,739,454.32
  5. Step 5: Solve for x
    x = 6,884,739,454.32/81,322.80
  6. Step 6: Final answer
    x = 84,659.40

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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.