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Finding the Fourth Proportional to 507.18, 699.58 and 307.96

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Solution

The fourth proportional to 507.18, 699.58 and 307.96 is: 424.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    507.18 : 699.58 = 307.96 : x
  2. Step 2: Convert to fraction form
    507.18/699.58 = 307.96/x
  3. Step 3: Cross multiply
    507.18x = 699.58 × 307.96
  4. Step 4: Simplify right side
    507.18x = 215,442.66
  5. Step 5: Solve for x
    x = 215,442.66/507.18
  6. Step 6: Final answer
    x = 424.79

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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.