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Finding the Fourth Proportional to 81,130.60, 121,741.71 and 43,689.88

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Solution

The fourth proportional to 81,130.60, 121,741.71 and 43,689.88 is: 65,559.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,130.60 : 121,741.71 = 43,689.88 : x
  2. Step 2: Convert to fraction form
    81,130.60/121,741.71 = 43,689.88/x
  3. Step 3: Cross multiply
    81,130.60x = 121,741.71 × 43,689.88
  4. Step 4: Simplify right side
    81,130.60x = 5,318,880,700.89
  5. Step 5: Solve for x
    x = 5,318,880,700.89/81,130.60
  6. Step 6: Final answer
    x = 65,559.49

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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.