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Finding the Fourth Proportional to 55,279.60, 82,919.40 and 45,438.10

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Solution

The fourth proportional to 55,279.60, 82,919.40 and 45,438.10 is: 68,157.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    55,279.60 : 82,919.40 = 45,438.10 : x
  2. Step 2: Convert to fraction form
    55,279.60/82,919.40 = 45,438.10/x
  3. Step 3: Cross multiply
    55,279.60x = 82,919.40 × 45,438.10
  4. Step 4: Simplify right side
    55,279.60x = 3,767,699,989.14
  5. Step 5: Solve for x
    x = 3,767,699,989.14/55,279.60
  6. Step 6: Final answer
    x = 68,157.15

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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.