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Finding the Fourth Proportional to 123,840.60, 170,890.56 and 72,855.36

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Solution

The fourth proportional to 123,840.60, 170,890.56 and 72,855.36 is: 100,534.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    123,840.60 : 170,890.56 = 72,855.36 : x
  2. Step 2: Convert to fraction form
    123,840.60/170,890.56 = 72,855.36/x
  3. Step 3: Cross multiply
    123,840.60x = 170,890.56 × 72,855.36
  4. Step 4: Simplify right side
    123,840.60x = 12,450,293,269.40
  5. Step 5: Solve for x
    x = 12,450,293,269.40/123,840.60
  6. Step 6: Final answer
    x = 100,534.83

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1.5x scale

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.