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Finding the Fourth Proportional to 508.45, 699.90 and 438.74

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Solution

The fourth proportional to 508.45, 699.90 and 438.74 is: 603.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    508.45 : 699.90 = 438.74 : x
  2. Step 2: Convert to fraction form
    508.45/699.90 = 438.74/x
  3. Step 3: Cross multiply
    508.45x = 699.90 × 438.74
  4. Step 4: Simplify right side
    508.45x = 307,074.13
  5. Step 5: Solve for x
    x = 307,074.13/508.45
  6. Step 6: Final answer
    x = 603.94

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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.