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Finding the Fourth Proportional to 85,861.98, 128,702.06 and 28,881.64

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Solution

The fourth proportional to 85,861.98, 128,702.06 and 28,881.64 is: 43,291.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,861.98 : 128,702.06 = 28,881.64 : x
  2. Step 2: Convert to fraction form
    85,861.98/128,702.06 = 28,881.64/x
  3. Step 3: Cross multiply
    85,861.98x = 128,702.06 × 28,881.64
  4. Step 4: Simplify right side
    85,861.98x = 3,717,125,992.87
  5. Step 5: Solve for x
    x = 3,717,125,992.87/85,861.98
  6. Step 6: Final answer
    x = 43,291.88

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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.