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Finding the Fourth Proportional to 85,523.40, 128,090.70 and 54,030.60

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Solution

The fourth proportional to 85,523.40, 128,090.70 and 54,030.60 is: 80,923.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,523.40 : 128,090.70 = 54,030.60 : x
  2. Step 2: Convert to fraction form
    85,523.40/128,090.70 = 54,030.60/x
  3. Step 3: Cross multiply
    85,523.40x = 128,090.70 × 54,030.60
  4. Step 4: Simplify right side
    85,523.40x = 6,920,817,375.42
  5. Step 5: Solve for x
    x = 6,920,817,375.42/85,523.40
  6. Step 6: Final answer
    x = 80,923.09

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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.