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Finding the Fourth Proportional to 699.45, 964.90 and 419.55

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Solution

The fourth proportional to 699.45, 964.90 and 419.55 is: 578.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    699.45 : 964.90 = 419.55 : x
  2. Step 2: Convert to fraction form
    699.45/964.90 = 419.55/x
  3. Step 3: Cross multiply
    699.45x = 964.90 × 419.55
  4. Step 4: Simplify right side
    699.45x = 404,823.80
  5. Step 5: Solve for x
    x = 404,823.80/699.45
  6. Step 6: Final answer
    x = 578.77

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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.