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Finding the Fourth Proportional to 138,485.80, 207,730.25 and 38,639.94

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Solution

The fourth proportional to 138,485.80, 207,730.25 and 38,639.94 is: 57,960.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,485.80 : 207,730.25 = 38,639.94 : x
  2. Step 2: Convert to fraction form
    138,485.80/207,730.25 = 38,639.94/x
  3. Step 3: Cross multiply
    138,485.80x = 207,730.25 × 38,639.94
  4. Step 4: Simplify right side
    138,485.80x = 8,026,684,396.19
  5. Step 5: Solve for x
    x = 8,026,684,396.19/138,485.80
  6. Step 6: Final answer
    x = 57,960.34

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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.