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Finding the Fourth Proportional to 243,679.80, 365,519.70 and 85,855.80

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Solution

The fourth proportional to 243,679.80, 365,519.70 and 85,855.80 is: 128,783.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    243,679.80 : 365,519.70 = 85,855.80 : x
  2. Step 2: Convert to fraction form
    243,679.80/365,519.70 = 85,855.80/x
  3. Step 3: Cross multiply
    243,679.80x = 365,519.70 × 85,855.80
  4. Step 4: Simplify right side
    243,679.80x = 31,381,986,259.26
  5. Step 5: Solve for x
    x = 31,381,986,259.26/243,679.80
  6. Step 6: Final answer
    x = 128,783.70

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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.