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Finding the Fourth Proportional to 148,912.64, 205,509.12 and 85,258.88

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Solution

The fourth proportional to 148,912.64, 205,509.12 and 85,258.88 is: 117,662.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    148,912.64 : 205,509.12 = 85,258.88 : x
  2. Step 2: Convert to fraction form
    148,912.64/205,509.12 = 85,258.88/x
  3. Step 3: Cross multiply
    148,912.64x = 205,509.12 × 85,258.88
  4. Step 4: Simplify right side
    148,912.64x = 17,521,477,400.99
  5. Step 5: Solve for x
    x = 17,521,477,400.99/148,912.64
  6. Step 6: Final answer
    x = 117,662.79

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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.