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Finding the Fourth Proportional to 85,465.80, 128,198.70 and 72,781.20

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Solution

The fourth proportional to 85,465.80, 128,198.70 and 72,781.20 is: 109,171.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,465.80 : 128,198.70 = 72,781.20 : x
  2. Step 2: Convert to fraction form
    85,465.80/128,198.70 = 72,781.20/x
  3. Step 3: Cross multiply
    85,465.80x = 128,198.70 × 72,781.20
  4. Step 4: Simplify right side
    85,465.80x = 9,330,455,224.44
  5. Step 5: Solve for x
    x = 9,330,455,224.44/85,465.80
  6. Step 6: Final answer
    x = 109,171.80

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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.