Home / 81,272.64-121,911.36-28,718.40

Finding the Fourth Proportional to 81,272.64, 121,911.36 and 28,718.40

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Solution

The fourth proportional to 81,272.64, 121,911.36 and 28,718.40 is: 43,078.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,272.64 : 121,911.36 = 28,718.40 : x
  2. Step 2: Convert to fraction form
    81,272.64/121,911.36 = 28,718.40/x
  3. Step 3: Cross multiply
    81,272.64x = 121,911.36 × 28,718.40
  4. Step 4: Simplify right side
    81,272.64x = 3,501,099,201.02
  5. Step 5: Solve for x
    x = 3,501,099,201.02/81,272.64
  6. Step 6: Final answer
    x = 43,078.45

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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.