Home / 81,020.40-121,530.60-28,435.20

Finding the Fourth Proportional to 81,020.40, 121,530.60 and 28,435.20

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Solution

The fourth proportional to 81,020.40, 121,530.60 and 28,435.20 is: 42,652.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,020.40 : 121,530.60 = 28,435.20 : x
  2. Step 2: Convert to fraction form
    81,020.40/121,530.60 = 28,435.20/x
  3. Step 3: Cross multiply
    81,020.40x = 121,530.60 × 28,435.20
  4. Step 4: Simplify right side
    81,020.40x = 3,455,746,917.12
  5. Step 5: Solve for x
    x = 3,455,746,917.12/81,020.40
  6. Step 6: Final answer
    x = 42,652.80

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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.