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Finding the Fourth Proportional to 507.91, 700.97 and 311.55

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Solution

The fourth proportional to 507.91, 700.97 and 311.55 is: 429.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    507.91 : 700.97 = 311.55 : x
  2. Step 2: Convert to fraction form
    507.91/700.97 = 311.55/x
  3. Step 3: Cross multiply
    507.91x = 700.97 × 311.55
  4. Step 4: Simplify right side
    507.91x = 218,385.65
  5. Step 5: Solve for x
    x = 218,385.65/507.91
  6. Step 6: Final answer
    x = 429.97

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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.