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Finding the Fourth Proportional to 403,391.40, 605,216.70 and 270,421.80

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Solution

The fourth proportional to 403,391.40, 605,216.70 and 270,421.80 is: 405,719.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    403,391.40 : 605,216.70 = 270,421.80 : x
  2. Step 2: Convert to fraction form
    403,391.40/605,216.70 = 270,421.80/x
  3. Step 3: Cross multiply
    403,391.40x = 605,216.70 × 270,421.80
  4. Step 4: Simplify right side
    403,391.40x = 163,663,789,404.06
  5. Step 5: Solve for x
    x = 163,663,789,404.06/403,391.40
  6. Step 6: Final answer
    x = 405,719.58

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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.