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Finding the Fourth Proportional to 81,968.40, 122,936.40 and 39,848.40

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Solution

The fourth proportional to 81,968.40, 122,936.40 and 39,848.40 is: 59,764.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,968.40 : 122,936.40 = 39,848.40 : x
  2. Step 2: Convert to fraction form
    81,968.40/122,936.40 = 39,848.40/x
  3. Step 3: Cross multiply
    81,968.40x = 122,936.40 × 39,848.40
  4. Step 4: Simplify right side
    81,968.40x = 4,898,818,841.76
  5. Step 5: Solve for x
    x = 4,898,818,841.76/81,968.40
  6. Step 6: Final answer
    x = 59,764.72

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1.5x scale

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.