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Finding the Fourth Proportional to 78,495.48, 117,669.60 and 28,563.12

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Solution

The fourth proportional to 78,495.48, 117,669.60 and 28,563.12 is: 42,817.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,495.48 : 117,669.60 = 28,563.12 : x
  2. Step 2: Convert to fraction form
    78,495.48/117,669.60 = 28,563.12/x
  3. Step 3: Cross multiply
    78,495.48x = 117,669.60 × 28,563.12
  4. Step 4: Simplify right side
    78,495.48x = 3,361,010,905.15
  5. Step 5: Solve for x
    x = 3,361,010,905.15/78,495.48
  6. Step 6: Final answer
    x = 42,817.89

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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.