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Finding the Fourth Proportional to 621.90, 933.18 and 275.22

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Solution

The fourth proportional to 621.90, 933.18 and 275.22 is: 412.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.90 : 933.18 = 275.22 : x
  2. Step 2: Convert to fraction form
    621.90/933.18 = 275.22/x
  3. Step 3: Cross multiply
    621.90x = 933.18 × 275.22
  4. Step 4: Simplify right side
    621.90x = 256,829.80
  5. Step 5: Solve for x
    x = 256,829.80/621.90
  6. Step 6: Final answer
    x = 412.98

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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.