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Finding the Fourth Proportional to 621.30, 931.95 and 405.06

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Solution

The fourth proportional to 621.30, 931.95 and 405.06 is: 607.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.30 : 931.95 = 405.06 : x
  2. Step 2: Convert to fraction form
    621.30/931.95 = 405.06/x
  3. Step 3: Cross multiply
    621.30x = 931.95 × 405.06
  4. Step 4: Simplify right side
    621.30x = 377,495.67
  5. Step 5: Solve for x
    x = 377,495.67/621.30
  6. Step 6: Final answer
    x = 607.59

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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.