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Finding the Fourth Proportional to 138,005.40, 206,862.30 and 78,713.40

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Solution

The fourth proportional to 138,005.40, 206,862.30 and 78,713.40 is: 117,986.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,005.40 : 206,862.30 = 78,713.40 : x
  2. Step 2: Convert to fraction form
    138,005.40/206,862.30 = 78,713.40/x
  3. Step 3: Cross multiply
    138,005.40x = 206,862.30 × 78,713.40
  4. Step 4: Simplify right side
    138,005.40x = 16,282,834,964.82
  5. Step 5: Solve for x
    x = 16,282,834,964.82/138,005.40
  6. Step 6: Final answer
    x = 117,986.94

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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.