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Finding the Fourth Proportional to 268,960.40, 403,440.60 and 81,981.20

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Solution

The fourth proportional to 268,960.40, 403,440.60 and 81,981.20 is: 122,971.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    268,960.40 : 403,440.60 = 81,981.20 : x
  2. Step 2: Convert to fraction form
    268,960.40/403,440.60 = 81,981.20/x
  3. Step 3: Cross multiply
    268,960.40x = 403,440.60 × 81,981.20
  4. Step 4: Simplify right side
    268,960.40x = 33,074,544,516.72
  5. Step 5: Solve for x
    x = 33,074,544,516.72/268,960.40
  6. Step 6: Final answer
    x = 122,971.80

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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.