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Finding the Fourth Proportional to 611,781.60, 917,672.40 and 399,205.20

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Solution

The fourth proportional to 611,781.60, 917,672.40 and 399,205.20 is: 598,807.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    611,781.60 : 917,672.40 = 399,205.20 : x
  2. Step 2: Convert to fraction form
    611,781.60/917,672.40 = 399,205.20/x
  3. Step 3: Cross multiply
    611,781.60x = 917,672.40 × 399,205.20
  4. Step 4: Simplify right side
    611,781.60x = 366,339,593,976.48
  5. Step 5: Solve for x
    x = 366,339,593,976.48/611,781.60
  6. Step 6: Final answer
    x = 598,807.80

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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.