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Finding the Fourth Proportional to 260,640.60, 390,968.20 and 92,137.12

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Solution

The fourth proportional to 260,640.60, 390,968.20 and 92,137.12 is: 138,208.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    260,640.60 : 390,968.20 = 92,137.12 : x
  2. Step 2: Convert to fraction form
    260,640.60/390,968.20 = 92,137.12/x
  3. Step 3: Cross multiply
    260,640.60x = 390,968.20 × 92,137.12
  4. Step 4: Simplify right side
    260,640.60x = 36,022,683,959.58
  5. Step 5: Solve for x
    x = 36,022,683,959.58/260,640.60
  6. Step 6: Final answer
    x = 138,208.26

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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.