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Finding the Fourth Proportional to 68,690.80, 103,036.20 and 53,119.60

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Solution

The fourth proportional to 68,690.80, 103,036.20 and 53,119.60 is: 79,679.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,690.80 : 103,036.20 = 53,119.60 : x
  2. Step 2: Convert to fraction form
    68,690.80/103,036.20 = 53,119.60/x
  3. Step 3: Cross multiply
    68,690.80x = 103,036.20 × 53,119.60
  4. Step 4: Simplify right side
    68,690.80x = 5,473,241,729.52
  5. Step 5: Solve for x
    x = 5,473,241,729.52/68,690.80
  6. Step 6: Final answer
    x = 79,679.40

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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.