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Finding the Fourth Proportional to 515,435.40, 771,840.90 and 491,815.80

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Solution

The fourth proportional to 515,435.40, 771,840.90 and 491,815.80 is: 736,471.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    515,435.40 : 771,840.90 = 491,815.80 : x
  2. Step 2: Convert to fraction form
    515,435.40/771,840.90 = 491,815.80/x
  3. Step 3: Cross multiply
    515,435.40x = 771,840.90 × 491,815.80
  4. Step 4: Simplify right side
    515,435.40x = 379,603,549,706.22
  5. Step 5: Solve for x
    x = 379,603,549,706.22/515,435.40
  6. Step 6: Final answer
    x = 736,471.63

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1.5x scale

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.