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Finding the Fourth Proportional to 78,009.54, 117,013.95 and 18,845.04

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Solution

The fourth proportional to 78,009.54, 117,013.95 and 18,845.04 is: 28,267.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,009.54 : 117,013.95 = 18,845.04 : x
  2. Step 2: Convert to fraction form
    78,009.54/117,013.95 = 18,845.04/x
  3. Step 3: Cross multiply
    78,009.54x = 117,013.95 × 18,845.04
  4. Step 4: Simplify right side
    78,009.54x = 2,205,132,568.31
  5. Step 5: Solve for x
    x = 2,205,132,568.31/78,009.54
  6. Step 6: Final answer
    x = 28,267.47

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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.