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Finding the Fourth Proportional to 136,686.40, 205,087.20 and 74,401.60

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Solution

The fourth proportional to 136,686.40, 205,087.20 and 74,401.60 is: 111,633.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    136,686.40 : 205,087.20 = 74,401.60 : x
  2. Step 2: Convert to fraction form
    136,686.40/205,087.20 = 74,401.60/x
  3. Step 3: Cross multiply
    136,686.40x = 205,087.20 × 74,401.60
  4. Step 4: Simplify right side
    136,686.40x = 15,258,815,819.52
  5. Step 5: Solve for x
    x = 15,258,815,819.52/136,686.40
  6. Step 6: Final answer
    x = 111,633.75

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1.5x scale

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.