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Finding the Fourth Proportional to 85,915.49, 128,831.09 and 35,305.35

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Solution

The fourth proportional to 85,915.49, 128,831.09 and 35,305.35 is: 52,940.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,915.49 : 128,831.09 = 35,305.35 : x
  2. Step 2: Convert to fraction form
    85,915.49/128,831.09 = 35,305.35/x
  3. Step 3: Cross multiply
    85,915.49x = 128,831.09 × 35,305.35
  4. Step 4: Simplify right side
    85,915.49x = 4,548,426,546.80
  5. Step 5: Solve for x
    x = 4,548,426,546.80/85,915.49
  6. Step 6: Final answer
    x = 52,940.71

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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.