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Finding the Fourth Proportional to 85,870.70, 128,781.44 and 28,938.41

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Solution

The fourth proportional to 85,870.70, 128,781.44 and 28,938.41 is: 43,399.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,870.70 : 128,781.44 = 28,938.41 : x
  2. Step 2: Convert to fraction form
    85,870.70/128,781.44 = 28,938.41/x
  3. Step 3: Cross multiply
    85,870.70x = 128,781.44 × 28,938.41
  4. Step 4: Simplify right side
    85,870.70x = 3,726,729,322.51
  5. Step 5: Solve for x
    x = 3,726,729,322.51/85,870.70
  6. Step 6: Final answer
    x = 43,399.31

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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.