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Finding the Fourth Proportional to 82,809.60, 124,214.40 and 80,505.60

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Solution

The fourth proportional to 82,809.60, 124,214.40 and 80,505.60 is: 120,758.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    82,809.60 : 124,214.40 = 80,505.60 : x
  2. Step 2: Convert to fraction form
    82,809.60/124,214.40 = 80,505.60/x
  3. Step 3: Cross multiply
    82,809.60x = 124,214.40 × 80,505.60
  4. Step 4: Simplify right side
    82,809.60x = 9,999,954,800.64
  5. Step 5: Solve for x
    x = 9,999,954,800.64/82,809.60
  6. Step 6: Final answer
    x = 120,758.40

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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.