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Finding the Fourth Proportional to 111,388.55, 153,724.35 and 63,640.88

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Solution

The fourth proportional to 111,388.55, 153,724.35 and 63,640.88 is: 87,829.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    111,388.55 : 153,724.35 = 63,640.88 : x
  2. Step 2: Convert to fraction form
    111,388.55/153,724.35 = 63,640.88/x
  3. Step 3: Cross multiply
    111,388.55x = 153,724.35 × 63,640.88
  4. Step 4: Simplify right side
    111,388.55x = 9,783,151,824.60
  5. Step 5: Solve for x
    x = 9,783,151,824.60/111,388.55
  6. Step 6: Final answer
    x = 87,829.06

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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.