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Finding the Fourth Proportional to 85,625.70, 128,489.28 and 47,706.72

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Solution

The fourth proportional to 85,625.70, 128,489.28 and 47,706.72 is: 71,588.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,625.70 : 128,489.28 = 47,706.72 : x
  2. Step 2: Convert to fraction form
    85,625.70/128,489.28 = 47,706.72/x
  3. Step 3: Cross multiply
    85,625.70x = 128,489.28 × 47,706.72
  4. Step 4: Simplify right side
    85,625.70x = 6,129,802,103.96
  5. Step 5: Solve for x
    x = 6,129,802,103.96/85,625.70
  6. Step 6: Final answer
    x = 71,588.34

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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.