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Finding the Fourth Proportional to 419.40, 578.88 and 375.66

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Solution

The fourth proportional to 419.40, 578.88 and 375.66 is: 518.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    419.40 : 578.88 = 375.66 : x
  2. Step 2: Convert to fraction form
    419.40/578.88 = 375.66/x
  3. Step 3: Cross multiply
    419.40x = 578.88 × 375.66
  4. Step 4: Simplify right side
    419.40x = 217,462.06
  5. Step 5: Solve for x
    x = 217,462.06/419.40
  6. Step 6: Final answer
    x = 518.51

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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.