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Finding the Fourth Proportional to 172,068.20, 258,015.90 and 78,468.20

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Solution

The fourth proportional to 172,068.20, 258,015.90 and 78,468.20 is: 117,662.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    172,068.20 : 258,015.90 = 78,468.20 : x
  2. Step 2: Convert to fraction form
    172,068.20/258,015.90 = 78,468.20/x
  3. Step 3: Cross multiply
    172,068.20x = 258,015.90 × 78,468.20
  4. Step 4: Simplify right side
    172,068.20x = 20,246,043,244.38
  5. Step 5: Solve for x
    x = 20,246,043,244.38/172,068.20
  6. Step 6: Final answer
    x = 117,662.90

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1.5x scale

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.