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Finding the Fourth Proportional to 515,438.40, 771,845.40 and 491,818.80

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Solution

The fourth proportional to 515,438.40, 771,845.40 and 491,818.80 is: 736,476.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    515,438.40 : 771,845.40 = 491,818.80 : x
  2. Step 2: Convert to fraction form
    515,438.40/771,845.40 = 491,818.80/x
  3. Step 3: Cross multiply
    515,438.40x = 771,845.40 × 491,818.80
  4. Step 4: Simplify right side
    515,438.40x = 379,608,078,413.52
  5. Step 5: Solve for x
    x = 379,608,078,413.52/515,438.40
  6. Step 6: Final answer
    x = 736,476.13

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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.