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Finding the Fourth Proportional to 260,144.40, 390,216.60 and 135,469.20

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Solution

The fourth proportional to 260,144.40, 390,216.60 and 135,469.20 is: 203,203.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    260,144.40 : 390,216.60 = 135,469.20 : x
  2. Step 2: Convert to fraction form
    260,144.40/390,216.60 = 135,469.20/x
  3. Step 3: Cross multiply
    260,144.40x = 390,216.60 × 135,469.20
  4. Step 4: Simplify right side
    260,144.40x = 52,862,330,628.72
  5. Step 5: Solve for x
    x = 52,862,330,628.72/260,144.40
  6. Step 6: Final answer
    x = 203,203.80

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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.