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Finding the Fourth Proportional to 419.33, 578.74 and 253.57

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Solution

The fourth proportional to 419.33, 578.74 and 253.57 is: 349.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    419.33 : 578.74 = 253.57 : x
  2. Step 2: Convert to fraction form
    419.33/578.74 = 253.57/x
  3. Step 3: Cross multiply
    419.33x = 578.74 × 253.57
  4. Step 4: Simplify right side
    419.33x = 146,746.94
  5. Step 5: Solve for x
    x = 146,746.94/419.33
  6. Step 6: Final answer
    x = 349.96

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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.