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Finding the Fourth Proportional to 78,885.56, 108,866.50 and 43,078.90

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Solution

The fourth proportional to 78,885.56, 108,866.50 and 43,078.90 is: 59,451.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,885.56 : 108,866.50 = 43,078.90 : x
  2. Step 2: Convert to fraction form
    78,885.56/108,866.50 = 43,078.90/x
  3. Step 3: Cross multiply
    78,885.56x = 108,866.50 × 43,078.90
  4. Step 4: Simplify right side
    78,885.56x = 4,689,849,066.85
  5. Step 5: Solve for x
    x = 4,689,849,066.85/78,885.56
  6. Step 6: Final answer
    x = 59,451.30

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.