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Finding the Fourth Proportional to 123,215.80, 170,005.50 and 72,201.14

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Solution

The fourth proportional to 123,215.80, 170,005.50 and 72,201.14 is: 99,618.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    123,215.80 : 170,005.50 = 72,201.14 : x
  2. Step 2: Convert to fraction form
    123,215.80/170,005.50 = 72,201.14/x
  3. Step 3: Cross multiply
    123,215.80x = 170,005.50 × 72,201.14
  4. Step 4: Simplify right side
    123,215.80x = 12,274,590,906.27
  5. Step 5: Solve for x
    x = 12,274,590,906.27/123,215.80
  6. Step 6: Final answer
    x = 99,618.64

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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.