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Finding the Fourth Proportional to 399,307.60, 598,961.40 and 133,076.80

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Solution

The fourth proportional to 399,307.60, 598,961.40 and 133,076.80 is: 199,615.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,307.60 : 598,961.40 = 133,076.80 : x
  2. Step 2: Convert to fraction form
    399,307.60/598,961.40 = 133,076.80/x
  3. Step 3: Cross multiply
    399,307.60x = 598,961.40 × 133,076.80
  4. Step 4: Simplify right side
    399,307.60x = 79,707,866,435.52
  5. Step 5: Solve for x
    x = 79,707,866,435.52/399,307.60
  6. Step 6: Final answer
    x = 199,615.20

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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.