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Finding the Fourth Proportional to 85,515.60, 128,273.40 and 73,851.60

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Solution

The fourth proportional to 85,515.60, 128,273.40 and 73,851.60 is: 110,777.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,515.60 : 128,273.40 = 73,851.60 : x
  2. Step 2: Convert to fraction form
    85,515.60/128,273.40 = 73,851.60/x
  3. Step 3: Cross multiply
    85,515.60x = 128,273.40 × 73,851.60
  4. Step 4: Simplify right side
    85,515.60x = 9,473,195,827.44
  5. Step 5: Solve for x
    x = 9,473,195,827.44/85,515.60
  6. Step 6: Final answer
    x = 110,777.40

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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.