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Finding the Fourth Proportional to 78,606.60, 117,835.78 and 39,126.40

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Solution

The fourth proportional to 78,606.60, 117,835.78 and 39,126.40 is: 58,652.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,606.60 : 117,835.78 = 39,126.40 : x
  2. Step 2: Convert to fraction form
    78,606.60/117,835.78 = 39,126.40/x
  3. Step 3: Cross multiply
    78,606.60x = 117,835.78 × 39,126.40
  4. Step 4: Simplify right side
    78,606.60x = 4,610,489,862.59
  5. Step 5: Solve for x
    x = 4,610,489,862.59/78,606.60
  6. Step 6: Final answer
    x = 58,652.71

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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.