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Finding the Fourth Proportional to 85,720.98, 128,611.72 and 38,331.66

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Solution

The fourth proportional to 85,720.98, 128,611.72 and 38,331.66 is: 57,511.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,720.98 : 128,611.72 = 38,331.66 : x
  2. Step 2: Convert to fraction form
    85,720.98/128,611.72 = 38,331.66/x
  3. Step 3: Cross multiply
    85,720.98x = 128,611.72 × 38,331.66
  4. Step 4: Simplify right side
    85,720.98x = 4,929,900,723.06
  5. Step 5: Solve for x
    x = 4,929,900,723.06/85,720.98
  6. Step 6: Final answer
    x = 57,511.02

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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.