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Finding the Fourth Proportional to 85,720.80, 128,216.70 and 76,899.90

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Solution

The fourth proportional to 85,720.80, 128,216.70 and 76,899.90 is: 115,022.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,720.80 : 128,216.70 = 76,899.90 : x
  2. Step 2: Convert to fraction form
    85,720.80/128,216.70 = 76,899.90/x
  3. Step 3: Cross multiply
    85,720.80x = 128,216.70 × 76,899.90
  4. Step 4: Simplify right side
    85,720.80x = 9,859,851,408.33
  5. Step 5: Solve for x
    x = 9,859,851,408.33/85,720.80
  6. Step 6: Final answer
    x = 115,022.86

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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.