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Finding the Fourth Proportional to 507.40, 699.90 and 300.40

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Solution

The fourth proportional to 507.40, 699.90 and 300.40 is: 414.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    507.40 : 699.90 = 300.40 : x
  2. Step 2: Convert to fraction form
    507.40/699.90 = 300.40/x
  3. Step 3: Cross multiply
    507.40x = 699.90 × 300.40
  4. Step 4: Simplify right side
    507.40x = 210,249.96
  5. Step 5: Solve for x
    x = 210,249.96/507.40
  6. Step 6: Final answer
    x = 414.37

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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.