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Finding the Fourth Proportional to 667.95, 921.49 and 419.10

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Solution

The fourth proportional to 667.95, 921.49 and 419.10 is: 578.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    667.95 : 921.49 = 419.10 : x
  2. Step 2: Convert to fraction form
    667.95/921.49 = 419.10/x
  3. Step 3: Cross multiply
    667.95x = 921.49 × 419.10
  4. Step 4: Simplify right side
    667.95x = 386,194.36
  5. Step 5: Solve for x
    x = 386,194.36/667.95
  6. Step 6: Final answer
    x = 578.18

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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.