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Finding the Fourth Proportional to 783.95, 1,175.93 and 418.55

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Solution

The fourth proportional to 783.95, 1,175.93 and 418.55 is: 627.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    783.95 : 1,175.93 = 418.55 : x
  2. Step 2: Convert to fraction form
    783.95/1,175.93 = 418.55/x
  3. Step 3: Cross multiply
    783.95x = 1,175.93 × 418.55
  4. Step 4: Simplify right side
    783.95x = 492,183.41
  5. Step 5: Solve for x
    x = 492,183.41/783.95
  6. Step 6: Final answer
    x = 627.83

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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.