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Finding the Fourth Proportional to 85,871.70, 128,782.93 and 28,939.41

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Solution

The fourth proportional to 85,871.70, 128,782.93 and 28,939.41 is: 43,400.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,871.70 : 128,782.93 = 28,939.41 : x
  2. Step 2: Convert to fraction form
    85,871.70/128,782.93 = 28,939.41/x
  3. Step 3: Cross multiply
    85,871.70x = 128,782.93 × 28,939.41
  4. Step 4: Simplify right side
    85,871.70x = 3,726,902,012.27
  5. Step 5: Solve for x
    x = 3,726,902,012.27/85,871.70
  6. Step 6: Final answer
    x = 43,400.82

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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.