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Finding the Fourth Proportional to 260,418.11, 390,658.41 and 91,903.64

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Solution

The fourth proportional to 260,418.11, 390,658.41 and 91,903.64 is: 137,866.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    260,418.11 : 390,658.41 = 91,903.64 : x
  2. Step 2: Convert to fraction form
    260,418.11/390,658.41 = 91,903.64/x
  3. Step 3: Cross multiply
    260,418.11x = 390,658.41 × 91,903.64
  4. Step 4: Simplify right side
    260,418.11x = 35,902,929,875.61
  5. Step 5: Solve for x
    x = 35,902,929,875.61/260,418.11
  6. Step 6: Final answer
    x = 137,866.49

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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.