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Finding the Fourth Proportional to 415.24, 621.47 and 312.26

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Solution

The fourth proportional to 415.24, 621.47 and 312.26 is: 467.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    415.24 : 621.47 = 312.26 : x
  2. Step 2: Convert to fraction form
    415.24/621.47 = 312.26/x
  3. Step 3: Cross multiply
    415.24x = 621.47 × 312.26
  4. Step 4: Simplify right side
    415.24x = 194,060.22
  5. Step 5: Solve for x
    x = 194,060.22/415.24
  6. Step 6: Final answer
    x = 467.34

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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.