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Finding the Fourth Proportional to 39,878.31, 59,726.79 and 30,921.87

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Solution

The fourth proportional to 39,878.31, 59,726.79 and 30,921.87 is: 46,312.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,878.31 : 59,726.79 = 30,921.87 : x
  2. Step 2: Convert to fraction form
    39,878.31/59,726.79 = 30,921.87/x
  3. Step 3: Cross multiply
    39,878.31x = 59,726.79 × 30,921.87
  4. Step 4: Simplify right side
    39,878.31x = 1,846,864,035.90
  5. Step 5: Solve for x
    x = 1,846,864,035.90/39,878.31
  6. Step 6: Final answer
    x = 46,312.50

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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.