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Finding the Fourth Proportional to 115,772.81, 159,775.05 and 64,790.64

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Solution

The fourth proportional to 115,772.81, 159,775.05 and 64,790.64 is: 89,415.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    115,772.81 : 159,775.05 = 64,790.64 : x
  2. Step 2: Convert to fraction form
    115,772.81/159,775.05 = 64,790.64/x
  3. Step 3: Cross multiply
    115,772.81x = 159,775.05 × 64,790.64
  4. Step 4: Simplify right side
    115,772.81x = 10,351,927,745.53
  5. Step 5: Solve for x
    x = 10,351,927,745.53/115,772.81
  6. Step 6: Final answer
    x = 89,415.88

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.