Home / 81,281.21-121,896.51-28,678.37

Finding the Fourth Proportional to 81,281.21, 121,896.51 and 28,678.37

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Solution

The fourth proportional to 81,281.21, 121,896.51 and 28,678.37 is: 43,008.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,281.21 : 121,896.51 = 28,678.37 : x
  2. Step 2: Convert to fraction form
    81,281.21/121,896.51 = 28,678.37/x
  3. Step 3: Cross multiply
    81,281.21x = 121,896.51 × 28,678.37
  4. Step 4: Simplify right side
    81,281.21x = 3,495,793,215.49
  5. Step 5: Solve for x
    x = 3,495,793,215.49/81,281.21
  6. Step 6: Final answer
    x = 43,008.63

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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.