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Finding the Fourth Proportional to 85,612.14, 128,372.04 and 38,839.50

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Solution

The fourth proportional to 85,612.14, 128,372.04 and 38,839.50 is: 58,238.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,612.14 : 128,372.04 = 38,839.50 : x
  2. Step 2: Convert to fraction form
    85,612.14/128,372.04 = 38,839.50/x
  3. Step 3: Cross multiply
    85,612.14x = 128,372.04 × 38,839.50
  4. Step 4: Simplify right side
    85,612.14x = 4,985,905,847.58
  5. Step 5: Solve for x
    x = 4,985,905,847.58/85,612.14
  6. Step 6: Final answer
    x = 58,238.30

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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.