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Finding the Fourth Proportional to 78,495.60, 117,734.65 and 21,573.87

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Solution

The fourth proportional to 78,495.60, 117,734.65 and 21,573.87 is: 32,358.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,495.60 : 117,734.65 = 21,573.87 : x
  2. Step 2: Convert to fraction form
    78,495.60/117,734.65 = 21,573.87/x
  3. Step 3: Cross multiply
    78,495.60x = 117,734.65 × 21,573.87
  4. Step 4: Simplify right side
    78,495.60x = 2,539,992,033.60
  5. Step 5: Solve for x
    x = 2,539,992,033.60/78,495.60
  6. Step 6: Final answer
    x = 32,358.40

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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.