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Finding the Fourth Proportional to 85,657.75, 128,486.21 and 57,134.41

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Solution

The fourth proportional to 85,657.75, 128,486.21 and 57,134.41 is: 85,701.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,657.75 : 128,486.21 = 57,134.41 : x
  2. Step 2: Convert to fraction form
    85,657.75/128,486.21 = 57,134.41/x
  3. Step 3: Cross multiply
    85,657.75x = 128,486.21 × 57,134.41
  4. Step 4: Simplify right side
    85,657.75x = 7,340,983,801.49
  5. Step 5: Solve for x
    x = 7,340,983,801.49/85,657.75
  6. Step 6: Final answer
    x = 85,701.34

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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.