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Finding the Fourth Proportional to 403,625.60, 605,438.40 and 261,699.20

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Solution

The fourth proportional to 403,625.60, 605,438.40 and 261,699.20 is: 392,548.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    403,625.60 : 605,438.40 = 261,699.20 : x
  2. Step 2: Convert to fraction form
    403,625.60/605,438.40 = 261,699.20/x
  3. Step 3: Cross multiply
    403,625.60x = 605,438.40 × 261,699.20
  4. Step 4: Simplify right side
    403,625.60x = 158,442,744,929.28
  5. Step 5: Solve for x
    x = 158,442,744,929.28/403,625.60
  6. Step 6: Final answer
    x = 392,548.80

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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.