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Finding the Fourth Proportional to 85,849.90, 128,774.85 and 81,475.90

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Solution

The fourth proportional to 85,849.90, 128,774.85 and 81,475.90 is: 122,213.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,849.90 : 128,774.85 = 81,475.90 : x
  2. Step 2: Convert to fraction form
    85,849.90/128,774.85 = 81,475.90/x
  3. Step 3: Cross multiply
    85,849.90x = 128,774.85 × 81,475.90
  4. Step 4: Simplify right side
    85,849.90x = 10,492,046,801.12
  5. Step 5: Solve for x
    x = 10,492,046,801.12/85,849.90
  6. Step 6: Final answer
    x = 122,213.85

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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.