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Finding the Fourth Proportional to 260,124.40, 390,186.60 and 135,449.20

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Solution

The fourth proportional to 260,124.40, 390,186.60 and 135,449.20 is: 203,173.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    260,124.40 : 390,186.60 = 135,449.20 : x
  2. Step 2: Convert to fraction form
    260,124.40/390,186.60 = 135,449.20/x
  3. Step 3: Cross multiply
    260,124.40x = 390,186.60 × 135,449.20
  4. Step 4: Simplify right side
    260,124.40x = 52,850,462,820.72
  5. Step 5: Solve for x
    x = 52,850,462,820.72/260,124.40
  6. Step 6: Final answer
    x = 203,173.80

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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.