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Finding the Fourth Proportional to 123,236.28, 170,068.50 and 72,288

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Solution

The fourth proportional to 123,236.28, 170,068.50 and 72,288 is: 99,758.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    123,236.28 : 170,068.50 = 72,288 : x
  2. Step 2: Convert to fraction form
    123,236.28/170,068.50 = 72,288/x
  3. Step 3: Cross multiply
    123,236.28x = 170,068.50 × 72,288
  4. Step 4: Simplify right side
    123,236.28x = 12,293,911,728
  5. Step 5: Solve for x
    x = 12,293,911,728/123,236.28
  6. Step 6: Final answer
    x = 99,758.87

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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.