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Finding the Fourth Proportional to 699.58, 965.26 and 419.72

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Solution

The fourth proportional to 699.58, 965.26 and 419.72 is: 579.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    699.58 : 965.26 = 419.72 : x
  2. Step 2: Convert to fraction form
    699.58/965.26 = 419.72/x
  3. Step 3: Cross multiply
    699.58x = 965.26 × 419.72
  4. Step 4: Simplify right side
    699.58x = 405,140.29
  5. Step 5: Solve for x
    x = 405,140.29/699.58
  6. Step 6: Final answer
    x = 579.12

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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.