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Finding the Fourth Proportional to 507.18, 699.93 and 310.74

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Solution

The fourth proportional to 507.18, 699.93 and 310.74 is: 428.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    507.18 : 699.93 = 310.74 : x
  2. Step 2: Convert to fraction form
    507.18/699.93 = 310.74/x
  3. Step 3: Cross multiply
    507.18x = 699.93 × 310.74
  4. Step 4: Simplify right side
    507.18x = 217,496.25
  5. Step 5: Solve for x
    x = 217,496.25/507.18
  6. Step 6: Final answer
    x = 428.83

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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.