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Finding the Fourth Proportional to 403,395.20, 605,092.80 and 261,677.60

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Solution

The fourth proportional to 403,395.20, 605,092.80 and 261,677.60 is: 392,516.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    403,395.20 : 605,092.80 = 261,677.60 : x
  2. Step 2: Convert to fraction form
    403,395.20/605,092.80 = 261,677.60/x
  3. Step 3: Cross multiply
    403,395.20x = 605,092.80 × 261,677.60
  4. Step 4: Simplify right side
    403,395.20x = 158,339,231,681.28
  5. Step 5: Solve for x
    x = 158,339,231,681.28/403,395.20
  6. Step 6: Final answer
    x = 392,516.40

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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.