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Finding the Fourth Proportional to 85,531.80, 128,297.70 and 43,395.60

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Solution

The fourth proportional to 85,531.80, 128,297.70 and 43,395.60 is: 65,093.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,531.80 : 128,297.70 = 43,395.60 : x
  2. Step 2: Convert to fraction form
    85,531.80/128,297.70 = 43,395.60/x
  3. Step 3: Cross multiply
    85,531.80x = 128,297.70 × 43,395.60
  4. Step 4: Simplify right side
    85,531.80x = 5,567,555,670.12
  5. Step 5: Solve for x
    x = 5,567,555,670.12/85,531.80
  6. Step 6: Final answer
    x = 65,093.40

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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.