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Finding the Fourth Proportional to 621.30, 857.03 and 385.14

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Solution

The fourth proportional to 621.30, 857.03 and 385.14 is: 531.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.30 : 857.03 = 385.14 : x
  2. Step 2: Convert to fraction form
    621.30/857.03 = 385.14/x
  3. Step 3: Cross multiply
    621.30x = 857.03 × 385.14
  4. Step 4: Simplify right side
    621.30x = 330,073.21
  5. Step 5: Solve for x
    x = 330,073.21/621.30
  6. Step 6: Final answer
    x = 531.27

Related Problems

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Double scale
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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.