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Finding the Fourth Proportional to 78,511.61, 117,722.79 and 53,581.86

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Solution

The fourth proportional to 78,511.61, 117,722.79 and 53,581.86 is: 80,342.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,511.61 : 117,722.79 = 53,581.86 : x
  2. Step 2: Convert to fraction form
    78,511.61/117,722.79 = 53,581.86/x
  3. Step 3: Cross multiply
    78,511.61x = 117,722.79 × 53,581.86
  4. Step 4: Simplify right side
    78,511.61x = 6,307,806,052.59
  5. Step 5: Solve for x
    x = 6,307,806,052.59/78,511.61
  6. Step 6: Final answer
    x = 80,342.34

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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.