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Finding the Fourth Proportional to 76,806.66, 115,281.28 and 39,394.38

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Solution

The fourth proportional to 76,806.66, 115,281.28 and 39,394.38 is: 59,128.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    76,806.66 : 115,281.28 = 39,394.38 : x
  2. Step 2: Convert to fraction form
    76,806.66/115,281.28 = 39,394.38/x
  3. Step 3: Cross multiply
    76,806.66x = 115,281.28 × 39,394.38
  4. Step 4: Simplify right side
    76,806.66x = 4,541,434,551.21
  5. Step 5: Solve for x
    x = 4,541,434,551.21/76,806.66
  6. Step 6: Final answer
    x = 59,128.13

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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.