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Finding the Fourth Proportional to 81,118.40, 121,683.90 and 28,539.68

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Solution

The fourth proportional to 81,118.40, 121,683.90 and 28,539.68 is: 42,811.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,118.40 : 121,683.90 = 28,539.68 : x
  2. Step 2: Convert to fraction form
    81,118.40/121,683.90 = 28,539.68/x
  3. Step 3: Cross multiply
    81,118.40x = 121,683.90 × 28,539.68
  4. Step 4: Simplify right side
    81,118.40x = 3,472,819,567.15
  5. Step 5: Solve for x
    x = 3,472,819,567.15/81,118.40
  6. Step 6: Final answer
    x = 42,811.74

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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.