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Finding the Fourth Proportional to 268,300, 402,639.54 and 128,069.56

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Solution

The fourth proportional to 268,300, 402,639.54 and 128,069.56 is: 192,194.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    268,300 : 402,639.54 = 128,069.56 : x
  2. Step 2: Convert to fraction form
    268,300/402,639.54 = 128,069.56/x
  3. Step 3: Cross multiply
    268,300x = 402,639.54 × 128,069.56
  4. Step 4: Simplify right side
    268,300x = 51,565,868,726.40
  5. Step 5: Solve for x
    x = 51,565,868,726.40/268,300
  6. Step 6: Final answer
    x = 192,194.81

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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.