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Finding the Fourth Proportional to 403,480.20, 605,220.30 and 261,762.60

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Solution

The fourth proportional to 403,480.20, 605,220.30 and 261,762.60 is: 392,643.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    403,480.20 : 605,220.30 = 261,762.60 : x
  2. Step 2: Convert to fraction form
    403,480.20/605,220.30 = 261,762.60/x
  3. Step 3: Cross multiply
    403,480.20x = 605,220.30 × 261,762.60
  4. Step 4: Simplify right side
    403,480.20x = 158,424,039,300.78
  5. Step 5: Solve for x
    x = 158,424,039,300.78/403,480.20
  6. Step 6: Final answer
    x = 392,643.90

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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.