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Finding the Fourth Proportional to 77,145.40, 115,645.20 and 45,579.70

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Solution

The fourth proportional to 77,145.40, 115,645.20 and 45,579.70 is: 68,326.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    77,145.40 : 115,645.20 = 45,579.70 : x
  2. Step 2: Convert to fraction form
    77,145.40/115,645.20 = 45,579.70/x
  3. Step 3: Cross multiply
    77,145.40x = 115,645.20 × 45,579.70
  4. Step 4: Simplify right side
    77,145.40x = 5,271,073,522.44
  5. Step 5: Solve for x
    x = 5,271,073,522.44/77,145.40
  6. Step 6: Final answer
    x = 68,326.48

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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.