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Finding the Fourth Proportional to 78,495.81, 117,747.78 and 25,909.41

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Solution

The fourth proportional to 78,495.81, 117,747.78 and 25,909.41 is: 38,865.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,495.81 : 117,747.78 = 25,909.41 : x
  2. Step 2: Convert to fraction form
    78,495.81/117,747.78 = 25,909.41/x
  3. Step 3: Cross multiply
    78,495.81x = 117,747.78 × 25,909.41
  4. Step 4: Simplify right side
    78,495.81x = 3,050,775,508.61
  5. Step 5: Solve for x
    x = 3,050,775,508.61/78,495.81
  6. Step 6: Final answer
    x = 38,865.46

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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.