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Finding the Fourth Proportional to 415.07, 621.79 and 312.47

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Solution

The fourth proportional to 415.07, 621.79 and 312.47 is: 468.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    415.07 : 621.79 = 312.47 : x
  2. Step 2: Convert to fraction form
    415.07/621.79 = 312.47/x
  3. Step 3: Cross multiply
    415.07x = 621.79 × 312.47
  4. Step 4: Simplify right side
    415.07x = 194,290.72
  5. Step 5: Solve for x
    x = 194,290.72/415.07
  6. Step 6: Final answer
    x = 468.09

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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.