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Finding the Fourth Proportional to 78,155.64, 117,233.73 and 18,991.08

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Solution

The fourth proportional to 78,155.64, 117,233.73 and 18,991.08 is: 28,486.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,155.64 : 117,233.73 = 18,991.08 : x
  2. Step 2: Convert to fraction form
    78,155.64/117,233.73 = 18,991.08/x
  3. Step 3: Cross multiply
    78,155.64x = 117,233.73 × 18,991.08
  4. Step 4: Simplify right side
    78,155.64x = 2,226,395,145.13
  5. Step 5: Solve for x
    x = 2,226,395,145.13/78,155.64
  6. Step 6: Final answer
    x = 28,486.69

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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.