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Finding the Fourth Proportional to 621.22, 931.84 and 347.58

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Solution

The fourth proportional to 621.22, 931.84 and 347.58 is: 521.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.22 : 931.84 = 347.58 : x
  2. Step 2: Convert to fraction form
    621.22/931.84 = 347.58/x
  3. Step 3: Cross multiply
    621.22x = 931.84 × 347.58
  4. Step 4: Simplify right side
    621.22x = 323,888.95
  5. Step 5: Solve for x
    x = 323,888.95/621.22
  6. Step 6: Final answer
    x = 521.38

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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.