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Finding the Fourth Proportional to 403,328.80, 604,993.20 and 261,611.20

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Solution

The fourth proportional to 403,328.80, 604,993.20 and 261,611.20 is: 392,416.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    403,328.80 : 604,993.20 = 261,611.20 : x
  2. Step 2: Convert to fraction form
    403,328.80/604,993.20 = 261,611.20/x
  3. Step 3: Cross multiply
    403,328.80x = 604,993.20 × 261,611.20
  4. Step 4: Simplify right side
    403,328.80x = 158,272,997,043.84
  5. Step 5: Solve for x
    x = 158,272,997,043.84/403,328.80
  6. Step 6: Final answer
    x = 392,416.80

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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.