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Finding the Fourth Proportional to 123,861.80, 170,956.56 and 81,424.28

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Solution

The fourth proportional to 123,861.80, 170,956.56 and 81,424.28 is: 112,383.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    123,861.80 : 170,956.56 = 81,424.28 : x
  2. Step 2: Convert to fraction form
    123,861.80/170,956.56 = 81,424.28/x
  3. Step 3: Cross multiply
    123,861.80x = 170,956.56 × 81,424.28
  4. Step 4: Simplify right side
    123,861.80x = 13,920,014,809.28
  5. Step 5: Solve for x
    x = 13,920,014,809.28/123,861.80
  6. Step 6: Final answer
    x = 112,383.44

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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.