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Finding the Fourth Proportional to 621.01, 930.32 and 312.11

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Solution

The fourth proportional to 621.01, 930.32 and 312.11 is: 467.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.01 : 930.32 = 312.11 : x
  2. Step 2: Convert to fraction form
    621.01/930.32 = 312.11/x
  3. Step 3: Cross multiply
    621.01x = 930.32 × 312.11
  4. Step 4: Simplify right side
    621.01x = 290,362.18
  5. Step 5: Solve for x
    x = 290,362.18/621.01
  6. Step 6: Final answer
    x = 467.56

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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.